1. the capacity to derive pleasure from various forms of sexual activity and behavior, particularly from sexual intercourse.

2. all aspects of sexual behavior, including gender identity, orientation, attitudes, and activity.

3. in classical psychoanalytic theory, the “organ pleasure” derived from all erogenous zones and processes of the body, including the mouth, anus, urethra, breasts, skin, muscles, and genital organs, as well as such functions as sucking, biting, eating, defecating, urinating, masturbating, and having intercourse.