threesome

　

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1. 3人組,三つ組

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/08/17 09:24:35」(JST)

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This article is about sexual activities involving three people. For other uses, see Threesome (disambiguation).

"Three-way" redirects here. For other uses, see 3-way (disambiguation).

A threesome commonly refers to three people engaging in sexual activity together, although it can technically be used to refer to any set of three things. "Threesome" can also refer to a three-person romantic relationship (see polyamory or ménage à trois) that may or may not include sexual threesomes.

Threesomes are common elements of sexual fantasy, and are commonly depicted in pornography. They are a type of group sex, but as only three people are involved, may more frequently occur in more private, non-anonymous settings rather than in orgies, for example as casual sex among three friends, or arranged in a community of like-minded swingers.

Types

Sex acts involving a man and two women

The people involved in a threesome may have any combination of gender and sexual orientation, and be engaging in any number of acts with one or both of the other participants, such as sexual intercourse, oral sex, anal sex, or mutual masturbation.

For a partial list of sexual acts and positions that involve all participants, see sex positions with three participants.

One or more of the participants may be engaging in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other two participants. It is a matter of subjective definition whether participation of a third person without physical contact constitutes a threesome. This may relate to fetishes such as voyeurism or cuckolding.

Safety

As with all other forms of sexual activity, exchange of bodily fluids and contact of mucous membranes during a threesome may lead to the transmission of sexually transmitted infections. To ensure full efficacy when using barrier protection, care should be taken that neither side of a condom, female condom, dental dam, or medical glove contacts more than one partner's mucous membranes. Additionally, one should be aware that hands and sex toys can spread fluids between partners.

Media

These illustrations are examples of threesomes and are not intended to be exhaustive of either possible threesomes or threesomes in media.

• Painting by Édouard-Henri Avril: two men and a woman having a threesome.

• Double penetration in a threesome.

• A threesome involving two men and one woman.

• A threesome involving two women and one man.

See also

• Group sex
• Polyamory
• Swinging

References

English Journal

• Neurotrophins, endocannabinoids and thermo-transient receptor potential: a threesome in pain signalling.

• Devesa I1, Ferrer-Montiel A.
• The European journal of neuroscience.Eur J Neurosci.2014 Feb;39(3):353-62. doi: 10.1111/ejn.12455.
• Because of the social and economic costs of chronic pain, there is a growing interest in unveiling the cellular and molecular mechanisms underlying it with the aim of developing more effective medications. Pain signalling is a multicomponent process that involves the peripheral and central nervous s
• PMID 24494676

• HIV risk in group sexual encounters: an event-level analysis from a national online survey of MSM in the U.S.

• Grov C1, Rendina HJ, Ventuneac A, Parsons JT.
• The journal of sexual medicine.J Sex Med.2013 Sep;10(9):2285-94. doi: 10.1111/jsm.12227. Epub 2013 Jun 27.
• INTRODUCTION: Researchers have investigated group sexual encounters (GSEs) as potential sources for HIV/STI transmission among men who have sex with men (MSM); however, much of this work has focused on organized sex parties.AIM: To compare behavioral and social characteristics of groups of men who e
• PMID 23809410

• A tangled threesome: adiponectin, insulin sensitivity, and adiposity: can Mendelian randomization sort out causality?

• Kizer JR.
• Diabetes.Diabetes.2013 Apr;62(4):1007-9. doi: 10.2337/db12-1673.
• PMID 23520272

Japanese Journal

• 造形ワークショップを通した大学と行政、地域の連携による子育て支援 : 横浜市栄区・鎌倉女子大学連携事業「アート・キャラバン」の実践を通して

• 鎌倉女子大学紀要 14, 51-62, 2007-03-31
• NAID 110006405317

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• Threesome (1994) - IMDb

Directed by Andrew Fleming. With Lara Flynn Boyle, Josh Charles, Stephen Baldwin, Alexis Arquette. Eddy and Stuart share two-thirds of a dormitory suite. Due to bureaucratic error, a woman named Alex is added to their room. At ...

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