In human sexuality, top, bottom, and versatile are roles during sexual activity, especially between two men. A top is usually a person who penetrates, a bottom is usually one who receives penetration, and someone who is versatile engages in either or both roles. These terms may be elements of self-identity that indicate an individual's usual preference and habits, but might also describe broader sexual identities and social roles. Top is known formally as insertive sex role, and bottom is known formally as receptive sex role.