Switch (sexuality)

In human sexuality, top, bottom and versatile are sex positions during sexual activity, especially between two men. A top is usually a person who penetrates, a bottom is usually one who receives penetration, and a versatile engages in both activities. These terms may be elements of self-identity that indicate an individual’s usual preference, but might also describe broader social, psychological, or sexual identities.[1]

Top, bottom and versatile are also used in BDSM to describe similar—but distinct—BDSM identities and practices.