The terms top, bottom, and switch are used to describe roles during a sexual act, or they may more broadly denote a psychological, social, or sexual identity, or indicate one's usual preference. The terms top, bottom, and switch are also used in BDSM, with slightly different meanings. In BDSM, a top is the person doing something to someone else, and a bottom is the person receiving that act. In both contexts, the 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. The older term versatile is sometimes used instead of switch.

Female submission or femsub is an activity or relationship in which a woman submits to the direction of a sexual partner or has her body used sexually by or for the sexual pleasure of her partner. The expression is often associated with BDSM, where submission to such activity is usually voluntarily and consensual. Submission usually involves a degree of trust by the woman in her partner. The dominant partner is usually a man, but can also be another woman, or there can be multiple dominant partners simultaneously. The submissive woman may derive sexual pleasure or emotional gratification from relinquishing control to a trusted dominant partner.