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Group sex is sexual behavior involving more than two participants. Group sex can occur between people of all sexual orientations and genders. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. In places where non-monogamous sex is taboo or illegal, group sex may take place in private or clandestine locations including homes, hotel rooms, or private clubs. Fantasies of group sex are extremely common among both men and women, and group sex is a subgenre in pornographic films. ==Terms== In principle, any sexual behavior performed by more than two people can be referred to as group sex, but various terms are used to describe particular acts or combinations of people. Many swingers argue that non-swingers have conflated the terms because of lack of understanding and that there are distinct differences among the terms with specific meanings as to number, intent, sexual orientation, and familiarity of the persons involved. ;Circle jerk: Group masturbation among men, usually sitting in somewhat of a circle formation. ;Gang bang: A number of people performing sex acts on one person, either in turn or at the same time. ;Threesome or three-way: Three people all having sexual relations, not necessarily simultaneously. Not to be confused with ménage à trois (literally, "household of three"). ;Foursome or four-way: Sex between four people. Not to be confused with ménage à quatre ;Double penetration: When a person is entered or penetrated in the vagina and/or anus by two people at the same time. This usually is when one enters the anus while another enters the vagina, although it does also refer to two simultaneous penetrations in the same orifice. ;Spintrian: Term used by Suetonius to describe sexual group practices indulged in by the emperor Tiberius on Capri ;Monogamous Group Sex or Same Room Sex (a.k.a. Soft Swapping): Couples engaging in sexual activity in the same room but in separate pairs, without any swapping of partners or other major sexual activity between couples. 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「Group sex」の詳細全文を読む スポンサード リンク
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