Anal–oral sex, also referre to or described as anal–oral contact or anilingus (from anus + -lingus), is a form of oral sex involving contact between the anus or perineum of one person and the mouth (lips) or tongue of another. Non-clinical, slang terms include rimming, rim-job, salad tossing, butt/ass licking and eating ass. It is performed by both heterosexual and homosexual people. Depending upon the context in which it is performed, this sex act can either be used for personal pleasure among consenting parties or as a form of erotic humiliation.