An exhibition or orgy among couples who engage in either simple acts of copulation or perverted sexual encounters with other couples or singles taking turns at both performing and watching the other performers

Sex between three or more people

Sexual behavior involving four or more persons.

Sexual behaviour involving more than two people.

More than two people engaging in a sexual act.

Sexual activity among more than two people together in the same location.

Sexual interaction involving three or more people at the same time.

Sexual act engaging more than two people.

Simultaneous and mutual sexual activity between three or more individuals.

Swinging; Social-sexual activity between three or more people, with more than one partner or in close proximity of others