The terms top, bottom, and switch are used to describe an individual's role during a sexual act. They may more broadly denote a psychological, social, or sexual identity, or indicate one's usual preference. Terms top and bottom refer to active and passive roles, not to who is physically on top in a particular sexual act. A switch is someone who can act as both a top and bottom. Older terms of "active", "passive", and "versatile" are still often used, especially in the context of gay sex.