- 関
- coital、coition、copulation、copulatory、first intercourse、intercourse、mating、sex、sexual intercourse、venereal
WordNet
- tell the sex (of young chickens)
- the properties that distinguish organisms on the basis of their reproductive roles; "she didnt want to know the sex of the foetus" (同)gender, sexuality
- all of the feelings resulting from the urge to gratify sexual impulses; "he wanted a better sex life"; "the film contained no sex or violence" (同)sexual urge
- either of the two categories (male or female) into which most organisms are divided; "the war between the sexes"
- communication between individuals (同)social intercourse
- of or relating to coitus or copulation (同)copulatory
- a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation (同)withdrawal method, withdrawal, pulling out, onanism
PrepTutorEJDIC
- 性交(sexual intercourse)
- 〈U〉〈C〉『性』,性別 / 《the~》《形容詞を伴い集合的に》『男性』,『女性』 / 〈U〉(男女(雌雄)間の)相違[の意識] / 〈U〉性に関する事柄(情報) / 〈U〉性交 / 〈ひよこなど〉‘の'性別を見分ける
- (個人や帽団の間の)『交際』,交流,連絡,取引;(思想・気持ちなどの)(…との)相互交換,やりとり《+『between』(『with』)+『名』》 / =sexual intercourse
- 性交の,交接の
- 性交の,性交から起こる
- 性交,交接 / 連結,結合
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/02/14 23:22:18」(JST)
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This article is primarily about sexual intercourse in humans. For sexual intercourse among other animals, see Animal sexual behaviour.
The missionary position, the most common human sex position,[1][2] depicted by Édouard-Henri Avril.
Sexual intercourse, also known as copulation or coitus, commonly denotes the insertion and thrusting of a male's penis into a female's vagina for the purposes of sexual pleasure or reproduction.[3][4][5][6] The term can also describe other sexual penetrative acts, such as anal sex, oral sex, fingering, or use of a strap-on dildo.[3][6][7]
Sexual intercourse often plays a strong role in human bonding, usually being used solely for pleasure and commonly leading to stronger emotional bonds,[8] and there are a variety of views concerning what constitutes sexual intercourse or other sexual activity.[9][10] For example, non-penetrative sex (such as non-penetrative cunnilingus) has been referred to as "outercourse",[11][12][13] but may also be among the sexual acts contributing to human bonding and considered intercourse. The term sex, often a shorthand for sexual intercourse, can be taken to mean any form of sexual activity (i.e. all forms of intercourse and outercourse).[6][9][14][15] Because individuals can be at risk of contracting sexually transmitted infections during these activities,[16][17] although the transmission risk is significantly reduced during non-penetrative sex,[12][18] safe sex practices are advised.[16]
In human societies, some jurisdictions have placed various restrictive laws against certain sexual activities, such as sex with minors, incest, extramarital sex, position-of-trust sex, prostitution, sodomy, public lewdness, rape, and bestiality. Religious beliefs can play a role in decisions about sex, or its purpose, as well; for example, beliefs about what sexual acts constitute virginity loss or the decision to make a virginity pledge.[19][20][21] Some sections of Christianity commonly view sex between a married couple for the purpose of reproduction as holy, while other sections may not.[22] Modern Judaism and Islam view sexual intercourse between husband and wife as a spiritual and edifying action. Hinduism and Buddhism views on sexuality have differing interpretations.
Sexual intercourse between non-human animals is more often referred to as copulation; for most non-human animals, mating and copulation occurs at the point of estrus (the most fertile period of time in the female's reproductive cycle),[23][24] which increases the chances of successful impregnation. However, bonobos,[25] dolphins,[26] and chimpanzees are known to engage in sexual intercourse even when the female is not in estrus, and to engage in sex acts with same-sex partners.[26][27] Like humans engaging in sex primarily for pleasure,[8] this behavior in the aforementioned animals is also presumed to be for pleasure,[28] and a contributing factor to strengthening their social bonds.[8]
Contents
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Practices
See also: Human sexual activity and Human sexuality
Definitions and stimulation factors
Édouard-Henri Avril's depiction of a woman on top position, a position that is more likely to stimulate the clitoris.[1]
Sexual intercourse is also known as copulation, coitus or coition; coitus is derived from the Latin word coitio or coire, meaning "a coming together or joining together" or "to go together" and is usually defined as penile-vaginal penetration.[3][29][30][31] Penetration by the hardened, erect penis is additionally known as intromission, or by the Latin name immissio penis (Latin for "insertion of the penis").[32] Copulation, although usually used to describe the mating process of non-human animals, is defined as "the transfer of the sperm from male to female" or "the act of sexual procreation between a man and a woman".[33][34] As such, common vernacular and research often limit sexual intercourse to penile-vaginal penetration, with virginity loss being predicated on the activity,[9][10][19][20] while the term sex and the phrase "having sex" commonly mean any sexual activity – penetrative and non-penetrative.[9][14][35] The World Health Organization states that non-English languages and cultures use different terms for sexual activity, with slightly different meanings.[14]
Anal and oral sex may be regarded as sexual intercourse,[3][6][9] but they, as well as non-penetrative sex acts, may also be regarded as maintaining "technical virginity" or as "outercourse," regardless of any penetrative aspects.[20][36] Heterosexual couples often engage in these practices not only for sexual pleasure, but as a way of avoiding pregnancy and maintaining that they are virgins because they have not yet engaged in penile-vaginal sex.[10][20][37][38] Likewise, some gay men view frotting or oral sex as maintaining their virginity, with anal penetration regarded as virginity loss, while other gay men consider frotting or oral sex to be their main forms of intercourse.[39][40][41][42] Lesbians may regard oral sex or fingering as loss of virginity,[43][44] and may also regard tribadism as a primary form of sexual activity.[2][45]
19th-century erotic interpretation of Hadrian and Antinous engaged in anal sex, by Paul Avril.
In 1999, a study by the Kinsey Institute, published in JAMA (the Journal of the American Medical Association), examined the definition of sex based on a 1991 random sample of 599 college students from 29 U.S. states; it reported that 60% said oral-genital contact (fellatio, cunnilingus) did not constitute having sex.[35][46] Similarly, a 2003 study published in the Canadian Journal of Human Sexuality focusing on definitions of having sex and noting studies concerning university students from the United States, the United Kingdom, and Australia reported that "[w]hile the vast majority of respondents (more than 97%) in these three studies included penile-vaginal intercourse in their definition of sex, fewer (between 70% and 90%) respondents considered penile-anal intercourse to constitute having sex" and that "oral-genital behaviours were defined as sex by between 32% and 58% of respondents".[9] A different study by the Kinsey Institute sampled 484 people, ranging in ages 18–96. "Nearly 95 percent of people in the study agreed that penile-vaginal intercourse meant 'had sex.' But the numbers changed as the questions got more specific." 11 percent of respondents based "had sex" on whether the man had achieved an orgasm, concluding that absence of an orgasm does not constitute "having had" sex. "About 80 percent of respondents said penile-anal intercourse meant 'had sex.' About 70 percent of people believed oral sex was sex."[35]
Édouard-Henri Avril drawing depicting cunnilingus in the life of Sappho.
Sexual activity can encompass a number of sexual behaviors, including different sex positions[2][3][9] or the use of sex toys. Foreplay may precede particular sexual activities, and often leads to sexual arousal of the partners, resulting in the erection of the penis or (usually) natural lubrication of the vagina.[47]
During coitus, the partners move their hips to move the penis backward and forward inside the vagina to cause friction, typically without fully removing the penis. In this way, they stimulate themselves and each other, often continuing until orgasm in either or both partners is achieved.[29] For human females, stimulation of the clitoris plays a significant role in sexual activity; 70–80% require direct clitoral stimulation to achieve orgasm,[48][49][50][51] though indirect clitoral stimulation (for example, via vaginal intercourse) may also be sufficient (see orgasm in females).[52][53] As such, some couples may engage in the woman on top position or the coital alignment technique, a technique combining the "riding high" variation of the missionary position with pressure-counterpressure movements performed by each partner in rhythm with sexual penetration, to maximize clitoral stimulation.[1][3][54][55]
Anal sex involves stimulation of the anus, anal cavity, sphincter valve or rectum, mostly commonly employing the insertion of a man's penis into another person's rectum.[56][57] Oral sex consists of all the sexual activities that involve the use of the tongue, rest of the mouth and throat to stimulate genitalia. It is sometimes performed to the exclusion of all other forms of sexual activity, and may include the ingestion or absorption of semen or vaginal fluids.[11][58] Fingering is the manual (genital) manipulation of the clitoris, vulva, vagina, or anus for the purpose of sexual arousal and sexual stimulation. It may constitute the entire sexual encounter or it may be part of mutual masturbation, foreplay or other sexual activities.[58][59]
Bonding and affection
In animals, copulation ranges from a purely reproductive activity to one of emotional bonding between mated pairs. Sexual intercourse and other sexual activity typically plays a powerful role in human bonding. For example, in many societies, it is normal for couples to have frequent intercourse while using some method of birth control (contraception), sharing pleasure and strengthening their emotional bond through sexual activity even though they are deliberately avoiding pregnancy.[8]
In humans and bonobos, the female undergoes relatively concealed ovulation so that both male and female partners commonly do not know whether she is fertile at any given moment. One possible reason for this distinct biological feature may be formation of strong emotional bonds between sexual partners important for social interactions and, in the case of humans, long-term partnership rather than immediate sexual reproduction.[8]
Humans, bonobos, dolphins, and chimpanzees are all intelligent social animals, whose cooperative behavior proves significantly more successful than that of any individual alone. In these animals, the use of sex has evolved beyond reproduction, to apparently serve additional social functions.[25][26][27] Sex reinforces intimate social bonds between individuals to form larger social structures. The resulting cooperation encourages collective tasks that promote the survival of each member of the group.[8]
Duration and sexual difficulties
Sexual intercourse often ends when the man has ejaculated, and thus the partner might not have time to reach orgasm. In addition, premature ejaculation (PE) is common, and women often require a substantially longer duration of stimulation with a sexual partner than men do before reaching an orgasm.[47][60][61] Masters and Johnson found that men took about 4 minutes to reach orgasm with their partners; women took about 10–20 minutes to reach orgasm with their partners, but 4 minutes to reach orgasm when they masturbated.[47] Scholars Weiten, Dunn and Hammer have reasoned, "Unfortunately, many couples are locked into the idea that orgasms should be achieved only through intercourse [penetrative vaginal sex]. Even the word foreplay suggests that any other form of sexual stimulation is merely preparation for the 'main event.'... ...Because women reach orgasm through intercourse less consistently than men, they are more likely than men to have faked an orgasm."[47]
In 1991, scholars June M. Reinisch and Ruth Beasley of the Kinsey Institute stated, "The truth is that the time between penetration and ejaculation varies not only from man to man, but from one time to the next for the same man." They added that the appropriate length for intercourse is the length of time it takes for both partners to be mutually satisfied, emphasizing that Kinsey "found that 75 percent of men ejaculated within two minutes of penetration. But he didn't ask if the men or their partners considered two minutes mutually satisfying" and "more recent research reports slightly longer times for intercourse".[62] A 2008 survey of Canadian and American sex therapists stated that the average time for intromission was 7 minutes and that 1 to 2 minutes was too short, 3 to 7 minutes was adequate and 7 to 13 minutes desirable, while 10 to 30 minutes was too long.[63][64]
Anorgasmia is regular difficulty reaching orgasm after ample sexual stimulation, causing personal distress. This is much more common in women than in men.[61][65] The physical structure of the act of coitus favors penile stimulation over clitoral stimulation. The location of the clitoris then usually necessitates manual stimulation in order for the female to achieve orgasm.[47] About 15% of women report difficulties with orgasm, 10% have never climaxed, and 40–50% have either complained about sexual dissatisfaction or experienced difficulty becoming sexually aroused at some point in their lives. A 1994 Laumann study reported that 75% of men and 29% of women always have orgasms with their partner.[66]
Vaginismus is the involuntary tensing of the pelvic floor musculature, making coitus distressing, painful, and sometimes impossible for women.[65][67][68] It is a conditioned reflex of the pubococcygeus muscle, sometimes referred to as the "PC muscle". Vaginismus can be a vicious cycle for women; they expect to experience pain during intercourse, which then causes a muscle spasm, which leads to painful intercourse. Treatment of vaginismus often includes both psychological and behavioral techniques, including the use of vaginal dilators. A new medical treatment using Botox is in the testing phase.[65][69] Some women also experience dyspareunia, a medical term for painful or uncomfortable intercourse, of unknown cause.[70][71]
About 40% of males suffer from some form of erectile dysfunction (ED) or impotence, at least occasionally.[72] For those whose impotence is caused by medical conditions, prescription drugs such as Viagra, Cialis, and Levitra are available. However, doctors caution against the unnecessary use of these drugs because they are accompanied by serious risks such as increased chance of heart attack. Moreover, using a drug to counteract the symptom—impotence—can mask the underlying problem causing the impotence and does not resolve it. A serious medical condition might be aggravated if left untreated.[73]
Premature ejaculation is more common than erectile dysfunction. "Estimates vary, but as many as 1 out of 3 men may be affected by [premature ejaculation] at some time."[60] "Masters and Johnson speculated that premature ejaculation is the most common sexual dysfunction, even though more men seek therapy for erectile difficulties." This is because, "although an estimated 15 percent to 20 percent of men experience difficulty controlling rapid ejaculation, most do not consider it a problem requiring help, and many women have difficulty expressing their sexual needs".[62] The American Urological Association (AUA) estimates that premature ejaculation could affect 21 percent of men in the United States.[74] The Food and Drug Administration (FDA or USFDA) is examining the drug dapoxetine to treat premature ejaculation. In clinical trials, those with PE who took dapoxetine experienced intercourse three to four times longer before orgasm than without the drug. Another ejaculation-related disorder is delayed ejaculation, which can be caused as an unwanted side effect of antidepressant medications such as Fluvoxamine.[75][76]
Although disability-related pain and mobility impairment can hamper intercourse, in many cases the most significant impediments to intercourse for individuals with a disability are psychological.[77] In particular, people who have a disability can find intercourse daunting due to issues involving their self-concept as a sexual being,[78][79] or partner's discomfort or perceived discomfort.[77] Temporary difficulties can arise with alcohol and sex, as alcohol initially increases interest (through disinhibition) but decreases capacity with greater intake.[80]
Reproduction, reproductive methods and pregnancy
Reproduction among humans usually occurs with penile-vaginal penetration.[81] Male orgasm usually includes ejaculation, a series of muscular contractions that deliver semen containing male gametes known as sperm cells or spermatozoa from the penis into the vagina. The subsequent route of the sperm from the vault of the vagina is through the cervix and into the uterus, and then into the fallopian tubes. Millions of sperm are present in each ejaculation, to increase the chances of one fertilizing an egg or ovum (see sperm competition). When a fertile ovum from the female is present in the fallopian tubes, the male gamete joins with the ovum, resulting in fertilization and the formation of a new embryo. When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus – known as the endometrium – and a pregnancy begins.[81] Unlike most species, human sexual activity is not linked to periods of estrus and can take place at any time during the reproductive cycle, even during pregnancy.[82] Where a sperm donor has sexual intercourse with a woman who is not his partner, for the sole purpose of impregnating the woman, this may be known as natural insemination, as opposed to artificial insemination. However, most sperm donors donate their sperm through a sperm bank and pregnancy is achieved through artificial insemination.[83] Artificial insemination is performed with the express intention of attempting to impregnate the female, and, to this extent, its purpose is the medical equivalent of sexual intercourse.
In 2005, the World Health Organization (WHO) estimated that 123 million women become pregnant world-wide each year, and around 87 million of those pregnancies or 70.7% are unintentional. About 46 million pregnancies per year reportedly end in induced abortion.[84] About 6 million U.S. women become pregnant per year. Out of known pregnancies, two-thirds result in live births and roughly 25% in abortions; the remainder end in miscarriage. However, many more women become pregnant and miscarry without even realizing it, instead mistaking the miscarriage for an unusually heavy menstruation.[85] The U.S. teenage pregnancy rate fell by 27 percent between 1990 and 2000, from 116.3 pregnancies per 1,000 girls aged 15–19 to 84.5. This data includes live births, abortions, and fetal losses. Almost 1 million American teenage women, 10% of all women aged 15–19 and 19% of those who report having had intercourse, become pregnant each year.[86] Britain has been stated to have a teenage pregnancy rate similar to America's.[87]
Reproductive methods and pregnancy also extend to gay and lesbian couples. For gay male pairings, there is the option of surrogate pregnancy; for lesbian couples, there is donor insemination in addition to choosing surrogate pregnancy.[88][89] Further, developmental biologists have been researching and developing techniques to facilitate biological same-sex reproduction, though this has yet to be demonstrated in humans (see same-sex reproduction).[90][91] Surrogacy and donor insemination remain the primary methods. Surrogacy is an arrangement in which a woman carries and delivers a child for another couple or person. The woman may be the child's genetic mother (traditional surrogacy) or she may carry a pregnancy to delivery after having another woman's eggs transferred to her uterus (gestational surrogacy). Gay or lesbian pairings who want the host to have no genetic connection to the child may choose gestational surrogacy and enter into a contract with an egg donor. Gay male couples might decide that they should both contribute semen for the in vitro fertilisation (IVF) process, which further establishes the couple's joint intention to become parents.[89] Lesbian couples often have contracts drafted to extinguish the legal rights of the sperm donor, while creating legal rights for the parent who is not biologically related to the child.[92]
Safe sex and contraception
See also: Coitus interruptus
There are a variety of safe sex practices, including non-penetrative sex acts,[12][18] and heterosexual couples may use oral or anal sex (or both) as a means of birth control (contraception).[36][37][38][93] Safe sex is a relevant harm reduction philosophy.[16][94] Condoms are used as a form of safe sex and as a form of contraception. Condoms and dental dams are widely recommended for the prevention of sexually transmitted infections (STIs). According to reports by the National Institutes of Health (NIH) and World Health Organization (WHO), correct and consistent use of latex condoms reduces the risk of HIV/AIDS transmission by approximately 85–99% relative to risk when unprotected.[95][96]
In 2004, the Guttmacher Institute indicated in 2002 that 62% of the 62 million women aged 15–44 are currently using a contraceptive method, that among U.S. women who practice contraception, the Pill is the most popular choice (30.6%), followed by tubal sterilization (27.0%) and the male condom (18.0%), and that 27% of teenage women using contraceptives choose condoms as their primary method.[97] A 2006 Kaiser Family Foundation report stated that among sexually active 15- to 19-year-olds in the U.S., 83% of females and 91% of males reported using at least one method of birth control during last intercourse.[98]
The National Survey of Sexual Health and Behavior (NSSHB) indicated in 2010 that 1 of 4 acts of vaginal intercourse are condom-protected in the U.S. (1 in 3 among singles), condom use is higher among black and Hispanic Americans than among white Americans and those from other racial groups, and adults using a condom for intercourse were just as likely to rate the sexual extent positively in terms of arousal, pleasure and orgasm than when having intercourse without one.[99]
Prevalence of sexual activity
In 2003, Michael Bozon of the French Institut national d'études démographiques conducted a cross-cultural study titled At what age do women and men have their first sexual intercourse?. In the first group of the contemporary cultures he studied, which included sub-Saharan Africa (listing Mali, Senegal and Ethiopia), the data indicated that the age of men at sexual initiation in these societies is at later ages than that of women, but is often extra-marital; the study considered the Indian subcontinent also fell into this group, although data was only available from Nepal.[100] In the second group, the data indicated families encouraged daughters to delay marriage, and to abstain from sexual activity prior to it. However, sons are encouraged to gain experience with older women or prostitutes prior to marriage. Age of men at sexual initiation in these societies is at lower ages than that of women; this group includes Latin cultures, both from southern Europe (Portugal, Greece and Romania are noted) and from Latin America (Brazil, Chile, Dominican Republic). The study considered many Asian societies also fell into this group, although matching data were only available from Thailand.[100] In the third group, age of men and women at sexual initiation was more closely matched; there were two sub-groups, however. In non-Latin, Catholic countries (Poland and Lithuania are mentioned), age at sexual initiation was higher, suggesting later marriage and reciprocal valuing of male and female virginity. The same pattern of late marriage and reciprocal valuing of virginity was reflected in Singapore and Sri Lanka. The study considered China and Vietnam also fell into this group, although data were not available.[100] In northern and eastern European countries, age at sexual initiation was lower, with both men and women involved in sexual activity prior to any union formation; the study listed Switzerland, Germany and the Czech Republic as members of this group.[100]
According to a national survey conducted in the United States in 1995, at least 3/4 of all men and women in the U.S. engaged in sexual intercourse by their late teenage years, and more than 2/3 of all sexually experienced teens had 2 or more partners.[101] Based on the 2002 National Survey of Family Growth, published by the U.S. Department of Health and Human Services, the average age of first vaginal intercourse in U.S. participants aged 15 to 44 was 17.4 years for females and 17.0 years for males.[102][103] Special tabulations by the National Center for Health Statistics suggest that this figure has changed between 2006 and 2010 to 17.1 years for both males and females.[104] The Centers for Disease Control and Prevention (CDC) stated that 45.5 percent of girls and 45.7 percent of boys had engaged in sexual activity by 19 in 2002; in 2011, reporting their research from 2006–2010, the CDC stated that 43% of American unmarried teenage girls and 42% of American unmarried teenage boys have ever engaged in sexual intercourse.[105] The CDC also reports that American girls will most likely lose their virginity to a boy who is 1 to 3 years older than they are.[105]
According to the U.S. Department of Health and Human Services, teenagers are delaying sex until older ages.[106] Between 1988 and 2002, the percentage of people in the U.S. who have had intercourse between the ages of 15 to 19 fell from 60 to 46 percent for males, and from 51 to 46 percent for females.[106] Additionally, a 2006 survey conducted by The Observer suggested that most adolescents in Britain were waiting longer to have sexual intercourse than they were only a few years earlier.[107] In 2002, it was reported that 32% of British teenagers were having sex before the age of 16, while, in 2006, it was only 20%. The average age a British teenager lost his/her virginity was reportedly 17.13 years in 2002; in 2006, it was 17.44 years on average for girls and 18.06 for boys. The most notable drop among teens who reported having sex was 14- and 15-year-olds.[107] A 2008 survey conducted by YouGov for Channel 4 suggested that 40% of all 14- to 17-year-olds are sexually active, 74% of sexually active 14- to 17-year-olds have had a sexual experience under the age of consent, and 6% of teens would wait until marriage before having sex.[108]
Health effects
Benefits
In humans, sexual activity has been claimed to produce health benefits as varied as improved sense of smell,[109] stress and blood pressure reduction,[110][111] increased immunity,[112] and decreased risk of prostate cancer.[113][114][115] Sexual intimacy, as well as orgasms, increases levels of the hormone oxytocin, also known as "the love hormone", which helps people bond and build trust.[116][117][118] Sex is also known as one of many mood repair strategies, which means it can be used to help dissipate feelings of sadness or depression.[119] A long-term study of 3,500 people between 30 and 101 by clinical neuropsychologist David Weeks, MD, head of old age psychology at the Royal Edinburgh Hospital in Scotland, found that "sex helps you look between four and seven years younger", according to impartial ratings of the subjects' photos. Exclusive causation, however, is unclear, and the benefits may be indirectly related to sex and directly related to significant reductions in stress, greater contentment, and better sleep that sex promotes.[120][121][122]
Risks
Sexually transmitted infections (STIs) can be spread by person-to-person sexual contact, including sexual intercourse. There are 19 million new cases of sexually transmitted diseases every year in the U.S.,[123] and, in 2005, the World Health Organization estimated that 448 million people aged 15–49 were being infected a year with curable STIs such as syphilis, gonorrhoea and chlamydia.[124] In 2006, The Independent newspaper reported that the biggest rise in sexually transmitted infections was in syphilis, which rose by more than 20%, while increases were also seen in cases of genital warts and herpes.[125]
STIs are caused by bacteria, viruses and parasites, which are passed from person to person during sexual contact. Some, in particular HIV and syphilis, can also be passed in other ways including from mother to child during pregnancy and childbirth, through blood products, and by shared hypodermic needles.[124] Gonococcal or chlamydial infections often produce no symptoms at all. Untreated chlamydial infection can lead to female infertility and ectopic pregnancy. Human papillomavirus can lead to genital and cervical cancers. Syphilis can result in stillbirths and neonatal deaths. Untreated gonococcal infections result in miscarriages, preterm births, and perinatal deaths. Infants born to mothers with untreated gonorrhoea or chlamydia can develop serious eye infections, which can lead to blindness.[124] Hepatitis B can also be transmitted through sexual contact.[126] Globally, there are about 350 million chronic carriers of hepatitis B.[127]
Some STIs can cause ulceration, but even if they do not, they increase the risk of both acquiring and passing on HIV up to ten-fold.[124] HIV is one of the world's leading infectious killers, and, in 2010, approximately 30 million people were estimated to have died because of it since the beginning of the epidemic. Of the 2.7 million new HIV infections estimated to occur worldwide in 2010, 1.9 million (70%) were in Africa. "The estimated 1.2 million Africans who died of HIV-related illnesses in 2010 comprised 69% of the global total of 1.8 million deaths attributable to the epidemic."[128] It is diagnosed by blood tests, and while no cure has been found, it can be controlled with antiretroviral drugs, and patients can enjoy healthy and productive lives.[129]
The most effective way to avoid sexually transmitted infections is to abstain from sexual intercourse, including oral, vaginal, and anal sex, or to have sexual intercourse only with one long-term, uninfected partner, who also remains entirely monogamous. The World Health Organization says that "Male latex condoms, when used consistently and correctly, are highly effective in reducing the transmission of HIV and other sexually transmitted infections, including gonorrhoea, chlamydial infection and trichomoniasis."[124] In cases where infection is suspected, early medical intervention is highly beneficial in all cases.
People, especially those who get little or no physical exercise, have a slightly increased risk of triggering heart attack or sudden cardiac death when they engage in sexual intercourse, or any other vigorous physical exercise which is engaged in on a sporadic basis. Increased risk is temporary with incidents occurring within a few hours of the activity. Regular exercise reduces but does not eliminate the increased risk.[130]
Social effects
Adults
Alex Comfort and others posit three potential advantages of intercourse in humans, which are not mutually exclusive: reproductive, relational, and recreational.[8][131] While the development of the Pill and other highly effective forms of contraception in the mid- and late 20th century increased people's ability to segregate these three functions, they still overlap a great deal and in complex patterns. For example: A fertile couple may have intercourse while contracepting not only to experience sexual pleasure (recreational), but also as a means of emotional intimacy (relational), thus deepening their bonding, making their relationship more stable and more capable of sustaining children in the future (deferred reproductive). This same couple may emphasize different aspects of intercourse on different occasions, being playful during one episode of intercourse (recreational), experiencing deep emotional connection on another occasion (relational), and later, after discontinuing contraception, seeking to achieve pregnancy (reproductive, or more likely reproductive and relational).[131]
Nearly all Americans marry during their lifetime; yet close to half of all first marriages are expected to end in separation or divorce, many within a few years,[132] and subsequent marriages are even more likely to end.[133] Sexual dissatisfaction is associated with increased risk of divorce and relationship dissolution.[133]
According to the National Survey of Sexual Health and Behavior (NSSHB), in 2010, men whose most recent sexual encounter was with a relationship partner reported greater arousal, greater pleasure, fewer problems with erectile function, orgasm, and less pain during the event than men whose last sexual encounter was with a non-relationship partner.[99] According to the Journal of Counseling & Development, many women express that their most satisfying sexual experiences entail being connected to someone, rather than solely basing satisfaction on orgasm.[134]
Adolescents
With regard to adolescent sexuality, sexual intercourse is often for relational and recreational purposes as well. However, teenage pregnancy is usually disparaged, and research suggests that the earlier onset of puberty for children puts pressure on children and teenagers to act like adults before they are emotionally or cognitively ready,[135][136] and thus are at risk to suffer from emotional distress as a result of their sexual activities.[136][137][138][139][140] Some studies have concluded that engaging in sex leaves adolescents, and especially girls, with higher levels of stress and depression.[141] A majority of adolescents in the United States have been provided with some information regarding sexuality,[142] though there have been efforts among social conservatives in the United States government to limit sex education in public schools to abstinence-only sex education curricula.[143]
One group of Canadian researchers found a relationship between self-esteem and sexual activity. They found that students, especially girls, who were verbally abused by teachers or rejected by their peers were more likely than other students to engage in sex by the end of the Grade 7. The researchers speculate that low self-esteem increases the likelihood of sexual activity: "low self-esteem seemed to explain the link between peer rejection and early sex. Girls with a poor self-image may see sex as a way to become 'popular', according to the researchers".[144]
In India, there is growing evidence that adolescents are becoming more sexually active outside of marriage, which is feared to lead to an increase in the spread of HIV/AIDS among adolescents, as well as the number of unwanted pregnancies and abortions, and add to the conflict between contemporary social values. In India, adolescents have relatively poor access to health care and education, and with cultural norms opposing extramarital sexual behavior, "these implications may acquire threatening dimensions for the society and the nation".[145]
Not all views on adolescent sexual behavior are negative, however. Psychiatrist Lynn Ponton writes, "All adolescents have sex lives, whether they are sexually active with others, with themselves, or seemingly not at all," and that viewing adolescent sexuality as a potentially positive experience, rather than as something inherently dangerous, may help young people develop healthier patterns and make more positive choices regarding sex.[135] Likewise, others state that long-term romantic relationships allow adolescents to gain the skills necessary for high-quality relationships later in life[146] and develop feelings of self-worth. Overall, positive romantic relationships among adolescents can result in long-term benefits. High-quality romantic relationships are associated with higher commitment in early adulthood[147] and are positively associated with self-esteem, self-confidence, and social competence.[148][149]
Ethical, religious, and legal views
See also: Sexual ethics and Religion and sexuality
Erotic painting from India, 18th century
Erotic painting on ancient Greek kylix
While sexual intercourse is the natural mode of reproduction for the human species, humans have intricate moral and ethical guidelines which regulate the practice of sexual intercourse and vary according to religious and governmental laws. Some governments and religions also have strict designations of "appropriate" and "inappropriate" sexual behavior, which include restrictions on the types of sex acts which are permissible. A historically prohibited or regulated sex act is anal sex.[150][151]
Consent and sexual offenses
Sexual intercourse with a person against their will, or without their informed legal consent, is rape, and is considered a serious crime in most countries.[152] More than 90% of rape victims are female, 99% of rapists male, and only about 5% of rapists are strangers to the victims.[153]
Most developed countries have age of consent laws specifying the minimum legal age a person may engage in sexual intercourse with substantially older persons, usually set at about 16–18, while the legal age of consent ranges from 12–20 years of age or is not a matter of law in other countries.[154] Sex with a person under the age of consent, regardless of their stated consent, is often considered to be sexual assault or statutory rape depending on differences in ages of the participants. Some countries treat any sex with a person of diminished or insufficient mental capacity to give consent, regardless of age, as rape.[155]
The expression "sexual intercourse" has been used as a term of art in England and Wales and New York State. In England and Wales, from its enactment to its repeal on the 1 May 2004,[156] section 44 of the Sexual Offences Act 1956 read:
Where, on the trial of any offence under this Act, it is necessary to prove sexual intercourse (whether natural or unnatural), it shall not be necessary to prove the completion of the intercourse by the emission of seed, but the intercourse shall be deemed complete upon proof of penetration only.
- Unnatural
This expression refers to buggery, including both buggery with a person and buggery with an animal.[157] Zoophilia (bestiality) is sexual activity between humans and non-human animals or a preference for or fixation on such practice. People who practice zoophilia are known as zoophiles,[158] zoosexuals, or simply "zoos".[159] Zoophilia may also be known as zoosexuality.[159] Zoophilia is a paraphilia.[160][161][162][163] Sex with animals is not outlawed in some jurisdictions, but, in most countries, it is illegal under animal abuse laws or laws dealing with crimes against nature.
- Penetration
According to cases decided on the meaning of the statutory definition of carnal knowledge under the Offences against the Person Act 1828, which was in identical terms to this definition, the slightest penetration was sufficient.[164] The book "Archbold" said that it "submitted" that this continued to be the law under the new enactment.[165]
- Continuing act
See Kaitamaki v R [1985] AC 147, [1984] 3 WLR 137, [1984] 2 All ER 435, 79 Cr App R 251, [1984] Crim LR 564, PC (decided under equivalent legislation in New Zealand).
Section 7(2) of the Sexual Offences (Amendment) Act 1976 contained the following words: "In this Act . . . references to sexual intercourse shall be construed in accordance with section 44 of the Sexual Offences Act 1956 so far as it relates to natural intercourse (under which such intercourse is deemed complete on proof of penetration only)". The Act made provision, in relation to rape and related offences, for England and Wales, and for courts-martial elsewhere.
From 3 November 1994 to 1 May 2004, section 1(2)(a) of the Sexual Offences Act 1956 (as substituted by section 142 of the Criminal Justice and Public Order Act 1994) referred to "sexual intercourse with a person (whether vaginal or anal)". This section created the offence of rape in England and Wales.
The penal code in New York State provides: § 130.00 Sex offenses; definitions of terms: 1. "Sexual intercourse" has its ordinary meaning and occurs upon any penetration, however slight.[166]
Romantic relationships
Sexual orientation and gender
There are various legal positions regarding the definition and legality of sexual intercourse between persons of the same sex or gender. For example, in the 2003 New Hampshire Supreme Court case Blanchflower v. Blanchflower, it was held that female same-sex sexual relations did not constitute sexual intercourse, based on a 1961 definition from Webster's Third New International Dictionary; and thereby an accused wife in a divorce case was found not guilty of adultery. Some countries, such as Islamic countries, consider homosexual behavior to be an offense punishable by imprisonment or execution.[167]
Marriage and relationships
Sexual intercourse has traditionally been considered an essential part of a marriage; many religious customs required consummation of the marriage by sexual intercourse, and the failure for any reason to consummate the marriage was a ground for annulment, which did not require a divorce process. Annulment declaration implied that the marriage was void from the start – i.e. there was in law no marriage. Furthermore, continuing sexual relations between the marriage partners is commonly considered a 'marital right' by many religions, permissible to married couples, generally for the purpose of reproduction. Today, there is wide variation in the opinions and teachings about sexual intercourse relative to marriage and other intimate relationships by the world's religions. Examples:
- Most denominations of Christianity, including Catholicism,[22] have strict views or rules on what sexual practices are acceptable or, more specifically, what are not.[168] Most Christian views on sex are formed or influenced by various interpretations of the Bible.[169] Sex outside of marriage is considered a sin in some churches, and sex may be referred to as a "sacred covenant" between husband and wife. Historically, Christian teachings often promoted celibacy,[170] although today usually only certain members (for example certain religious leaders) of some groups take a vow of celibacy, forsaking both marriage and any type of sexual or romantic activity. Some Christians view sex, particularly sexual intercourse between a married couple, as "holy" or a "holy sacrament".[22][170] Some Christians interpret the Bible to forbid the "misuse of sexual organs" and take that to mean that only penile/vaginal penetrative intercourse is acceptable, while some argue that the Bible is not clear on oral sex and that it is a personal decision as to whether its acceptable within marriage.[171]
- In The Church of Jesus Christ of Latter-day Saints, or Mormonism, sexual relations within the bonds of matrimony are seen as beautiful and sacred. Mormons consider sexual relations to be ordained of God for the creation of children and for the expression of love between husband and wife. Members are encouraged to not have any sexual relations before marriage, and be completely faithful to their spouse after marriage.[172]
- In Judaism, a married Jewish man is required to provide his wife with sexual pleasure called onah (literally, "her time"), which is one of the conditions he takes upon himself as part of the Jewish marriage contract, ketubah, that he gives her during the Jewish wedding ceremony. In Jewish views on marriage, sexual desire is not evil, but must be satisfied in the proper time, place and manner.[173]
- Islam views sex within marriage as something pleasurable, a spiritual activity, and a duty.[174][175][176] In Shi'ia Islam, men are allowed to enter into an unlimited number of temporary marriages, which are contracted to last for a period of minutes to multiple years and permit sexual intercourse. Shi'ia women are allowed to enter only one marriage at a time, whether temporary or permanent.
- Wiccans believe that, as declared within the Charge of the Goddess, to "Let my [the Goddess] worship be within the heart that rejoiceth; for behold, all acts of love and pleasure are my rituals." This statement appears to allow one freedom to explore sensuality and pleasure, and mixed with the final maxim within the Wiccan Rede – "26. Eight words the Wiccan Rede fulfill – an’ it harm none, do what ye will."[177] – Wiccans are encouraged to be responsible with their sexual encounters, in whatever variety they may occur.[178]
- Hinduism has varied views about sexuality, but Hindu society, in general, perceives extramarital sex to be immoral and shameful.[174]
- Buddhist ethics, in its most common formulation, holds that one should neither be attached to nor crave sensual pleasure.
- In the Bahá'í Faith, sexual relationships are permitted only between a husband and wife.[179]
- Unitarian Universalists, with an emphasis on strong interpersonal ethics, do not place boundaries on the occurrence of sexual intercourse among consenting adults.[180]
- According to the Brahma Kumaris and Prajapita Brahma Kumaris religion, the power of lust is the root of all evil and worse than murder.[181] Purity (celibacy) is promoted for peace and to prepare for life in forthcoming Heaven on earth for 2,500 years when children will be created by the power of the mind.[182][183]
- Shakers believe that sexual intercourse is the root of all sin and that all people should therefore be celibate, including married couples. Predictably, the original Shaker community that peaked at 6,000 full members in 1840 dwindled to three members by 2009.[184]
In some cases, the sexual intercourse between two people is seen as counter to religious law or doctrine. In many religious communities, including the Catholic Church and Mahayana Buddhists, religious leaders are expected to refrain from sexual intercourse in order to devote their full attention, energy, and loyalty to their religious duties.[185]
Opposition to same-sex marriage is largely based on the belief that sexual intercourse and sexual orientation should be of a heterosexual nature.[186][187][188][189] The recognition of such marriages is a civil rights, political, social, moral, and religious issue in many nations, and the conflicts arise over whether same-sex couples should be allowed to enter into marriage, be required to use a different status (such as a civil union, which either grant equal rights as marriage or limited rights in comparison to marriage), or not have any such rights. A related issue is whether the term marriage should be applied.[171][190][191]
Other animals
Main article: Animal sexual behaviour
A pair of lions copulating in the Maasai Mara, Kenya
Mating houseflies
In zoology, copulation is often termed as the process in which a male introduces sperm into the female's body. Spiders have separate male and female sexes. Before mating and copulation, a male spins a small web and ejaculates on to it. He then stores the sperm in reservoirs on his large pedipalps, from which he transfers sperm to the female's genitals. Females can store sperm indefinitely.[192]
Many animals which live in the water use external fertilization, whereas internal fertilization may have developed from a need to maintain gametes in a liquid medium in the Late Ordovician epoch. Internal fertilization with many vertebrates (such as reptiles, some fish, and most birds) occur via cloacal copulation (see also hemipenis), while mammals copulate vaginally, and many basal vertebrates reproduce sexually with external fertilization.
However, some terrestrial arthropods do use external fertilization. For primitive insects, the male deposits spermatozoa on the substrate, sometimes stored within a special structure; courtship involves inducing the female to take up the sperm package into her genital opening; there is no actual copulation. In groups such as dragonflies and spiders, males extrude sperm into secondary copulatory structures removed from their genital opening, which are then used to inseminate the female. In dragonflies, it is a set of modified sternites on the second abdominal segment; in spiders, it is the male pedipalps. In advanced groups of insects, the male uses its aedeagus, a structure formed from the terminal segments of the abdomen, to deposit sperm directly (though sometimes in a capsule called a "spermatophore") into the female's reproductive tract.
Humans, bonobos,[25] chimpanzees and dolphins[26] are species known to engage in heterosexual behaviors even when the female is not in estrus, which is a point in her reproductive cycle suitable for successful impregnation. These species, and others, are also known to engage in homosexual behaviors.[27] Humans, bonobos and dolphins are all intelligent social animals, whose cooperative behavior proves far more successful than that of any individual alone. In these animals, the use of sex has evolved beyond reproduction, to apparently serve additional social functions. Sex reinforces intimate social bonds between individuals to form larger social structures. The resulting cooperation encourages collective tasks that promote the survival of each member of the group.[8]
See also
| Sexuality portal |
- Fuck
- Erogenous zone
- Human sexual response cycle
- Public sex
- Sexological testing
- Artificial insemination
- Sperm donation
References
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External links
| Wikimedia Commons has media related to: Sexual intercourse |
- The International Encyclopedia of Sexuality
- Glossario di Sessuologia clinica – Glossary of clinical sexology
- Janssen, D. F., Growing Up Sexually. Volume I. World Reference Atlas
- Introduction to Animal Reproduction
- Advantages of Sexual Reproduction
- Synonyms for sexual intercourse – the WikiSaurus list of synonyms and slang words for sexual intercourse in many languages
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UpToDate Contents
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- 1. 思春期の性 adolescent sexuality
- 2. 女性のオルガスム障害の治療 treatment of female orgasmic disorder
- 3. 男性性機能障害の概要 overview of male sexual dysfunction
- 4. セクシャルマイノリティの若年者：プライマリケアの概要 sexual minority youth overview of primary care
- 5. 同性と性行為する女性の医療 medical care of women who have sex with women
English Journal
- Genitourinary infection prevalence among women who used an intrauterine device or oral contraceptives.
- Demirbag BC, Köksal I, Kaya S.SourceDepartment of Nursing, Faculty of Health Sciences, Karadeniz Teknik University, 61080, Trabzon, Turkey, cdemirbag@gmail.com.
- Archives of gynecology and obstetrics.Arch Gynecol Obstet.2013 Oct;288(4):911-6. doi: 10.1007/s00404-013-2836-6. Epub 2013 Apr 4.
- PURPOSE: The study aimed at investigating genitourinary infection prevalence among women who used an intrauterine device (IUD) and oral contraceptives (OC) in relation with their socio-demographic characteristics.METHODS: The study was conducted at the Mother and Child Health and Family Planning cen
- PMID 23553202
- Sexual activity-related emergency department admissions: eleven years of experience at a Swiss university hospital.
- Pfortmueller CA, Koetter JN, Zimmermann H, Exadaktylos AK.SourceUniversity Department of General Internal Medicine, Inselspital Bern, Bern, Switzerland.
- Emergency medicine journal : EMJ.Emerg Med J.2013 Oct;30(10):846-50. doi: 10.1136/emermed-2012-201845. Epub 2012 Oct 25.
- PRINCIPALS: Most people enjoy sexual intercourse without complications, but a significant, if small, number need to seek emergency medical help for related health problems. The true incidence of these problems is not known. We therefore assessed all admissions to our emergency department (ED) in dir
- PMID 23100321
- Cognitive frameworks of virginity and first intercourse.
- Humphreys TP.Sourcea Department of Psychology , Trent University.
- Journal of sex research.J Sex Res.2013 Oct;50(7):664-75. doi: 10.1080/00224499.2012.677868. Epub 2012 Jul 24.
- Research has begun to examine the subjective meanings of virginity and first coitus, but little is known about how these understandings influence the first sexual intercourse event. The purpose of this study was to investigate the relationship between virginity scripts and the approach taken and dec
- PMID 22823597
Japanese Journal
- SEX AND SEARCHING FOR CHILDREN AMONG AKA FORAGERS AND NGANDU FARMERS OF CENTRAL AFRICA
- Barry S. HEWLETT & Barry S. HEWLETT
- African Study Monographs 31(3), 107-125, 2010-10-01
- … This study examines the reasons for having sex, the frequency of sex (coitus) per night, sexual practices during the post-partum sex taboo, and beliefs and practices regarding homosexuality, masturbation, the use of sexual stimulants and a variety of other sexual behaviors. …
- NAID 110007690567
- ジャリ,ピカビア,デュシャンにおける機械
- 平芳 幸浩
- デザイン理論 (56), 59-72, 2010
- NAID 40018886487
Related Links
- Celebrating the youthful expression of burgeoning sexuality with the dynamic world of high fashion, Coitus blurs the boundary between these realities.
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★リンクテーブル★
| リンク元 | 「性交」「venereal」「sex」「copulation」「mating」 |
| 拡張検索 | 「postcoitus」 |
「性交」
- 英
- sex、intercourse、copulation、sexual intercourse、coitus、coition、venereal、coital
- 同
- 交合、交接、交尾
- ラ
- coitus
- 関
- 性、性病、性別、初性交
「venereal」
- adj.
- 性病の、性交による
- 関
- coital、coition、coitus、copulation、intercourse、sex、sexual intercourse、sexually transmitted disease、STD、VD、venereal disease
「sex」
- n.
「copulation」
- n.
「mating」
「postcoitus」
- 性交後の、交配後の