Top, bottom, switch

BDSM couples, with the femme tops sitting on male bottoms who are kneeling, leashed and in handcuffs, at 2006 Cologne Pride, Germany.

The terms top, bottom, and switch are used to describe an individual's role during a BDSM activity. They may more broadly denote a psychological, social, or sexual identity, or indicate one's usual preference. Terms top and bottom refer to giving and receiving 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" and "passive" are still often used. In the context of gay sex, the terms are top, bottom, and versatile.