Threesome
A threesome is a form of group sex involving three people of any gender combination. The level of sexual activity among the three members may vary greatly. Some threesomes may involve one who has a voyeur role, sometimes the invited member is there for enhancing the experience which does not involve having intercourse with the couple role (this is sometimes referred to as soft-swinging), other threesomes may involve some same sex contact, and other threesomes actively involve all three members.
Sometimes the term threesome is confused with the term ménage à trois. Granted, both activities involve sex among three people. A threesome generally involves a couple that seeks out a third person for sex without the emotional entanglements that are normally seen in an open relationship. On the other hand, the term ménage à trois implies a special form of a threesome which involves an emotional bond among all three people and in many ways resembles more of an open relationship than a threesome.
Gallery
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Fresco from Pompeii: two men and a woman having a threesome.
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Painting by Édouard-Henri Avril: two men and a woman having a threesome.
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Drawing of one possible position for a threesome.
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Drawing of an oral threesome with one male and two females.