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In human sexuality, a threesome is sexual activity that involves three people at the same time. ''Threesome'' can also refer to a love triangle, a three-way romantic relationship. Though ''threesome'' is most commonly applied to a casual sexual activity involving sexual activity among three participants, a threesome may also be found in a long-term domestic relationship, such as polyamory or a ménage à trois.〔 A threesome is a form of group sex, but involving only three people. It may occur more frequently in private situations, such as spontaneous sexual activity among three friends, or arranged in a community of like-minded swingers or planned as a once-only experience;〔Marie Claire, September 10, 2011: (How I Planned a Ménage à Trois )〕 and rarely in anonymous settings, such as at orgies or other sex parties. Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties. Some couples use a threesome as a way to develop a love triangle (''ménage à trois'').〔Shere Hite, The Hite Report: The sexual experience of women, Munich, 1989〕 A threesome is a common element of sexual fantasy.〔 It is commonly depicted in pornography, but very rarely in mainstream cinema. == Types == The people involved in a threesome may have any combination of gender and sexual orientation. Each participant may engage in any type of sex act with one or both of the others, such as vaginal, anal or oral sex or mutual masturbation. One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other 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. ''Lucky Pierre'' is slang for a person performing both receptive and insertive anal and/or vaginal sex simultaneously during a threesome, being positioned between the two partners. A heterosexual threesome may involve two men and a woman, or one man and two women - that is, two men having sex with a woman (for example, in double penetration), or two women with a man. A bisexual threesome may involve a man having sex with a man and a woman, the woman having sex with a man and a woman, or all three having sex with each other. A homosexual threesome would involve either three men or three women. Other possibilities are possible, such as a man having sex with two women who are having sex with each other.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Threesome」の詳細全文を読む スポンサード リンク
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