Anilingus

Anilingus (from the Latin anus + -lingus, from lingere, "to lick", and commonly spelled "analingus") is an oral and anal sex act where one person stimulates the anus of another person by the use of their mouth, including lips, tongue, or teeth. It is also referred to as anal–oral contact and anal–oral sex, or colloquially as rimming or a rim job, and may be performed by or on people of any sexual orientation for personal pleasure or as a form of erotic humiliation.