Promiscuity is the practice of engaging in sexual activity frequently with different partners or being indiscriminate in the choice of sexual partners. The term can carry a moral judgment. A common example of behavior viewed as promiscuous by many cultures is the one-night stand, and its frequency is used by researchers as a marker for promiscuity.

Slut is an English-language term for a person, usually a woman, who is sexually promiscuous or considered to have loose sexual morals. It is predominately used as an insult, sexual slur or offensive term of disparagement. It originally meant "a dirty, slovenly woman", and is rarely used to refer to men, generally requiring clarification by use of the terms male slut or man whore.