Oral sex consists of all sexual activities that involve the use of the mouth, which may include use of the tongue, teeth, and throat, to stimulate genitalia. Cunnilingus refers to oral sex performed on a woman, and fellatio refers to oral sex performed on a man. Analingus refers to oral stimulation of the anus, and although it is a form of oral sex, the term "oral sex" usually refers to oral stimulation of the genitals.
People may engage in oral sex as part of foreplay before intercourse, or during or following intercourse. It may also be performed as its own sex act.