analingus

Anilingus (from the Latin anus + -lingus, from lingere, "to lick", variantly spelled "analingus") is the oral and anal sex act in which a person stimulates the anus of another by using the mouth, including lips, tongue, or teeth. It is also called anal–oral contact and anal–oral sex, and is additionally known by slang names.
Health risks include fecal–oral transmission of diseases.

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