3some

In human sexuality, a threesome is commonly understood as "a sexual interaction between three people whereby at least one engages in physical sexual behaviour with both the other individuals". Though threesome most commonly refers to sexual activity involving three participants, it is also sometimes used to apply to a long-term domestic relationship, such as polyamory or a ménage à trois.A threesome is a form of group sex which may occur in private situations, such as spontaneous sexual activity among three friends or in the context of casual sex or a hook up. Alternatively, it may take place in specific contexts or environments which allow for sex, such as swingers events, orgies or sex parties.
Threesomes are a common element of sexual fantasy, and are commonly depicted in pornography.

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