Anilingus

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, and/or teeth. It is also called anal–oral contact and anal–oral sex; colloquial names include rimming and rim job. It may be performed by and on persons of any sexual orientation for pleasure or as a form of erotic humiliation.

The term anilingus was coined by sexologist Richard von Krafft-Ebing in his book Psychopathia sexualis (1886).

Pleasure for the giver during anilingus is usually based more on the principle of the act. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Studies indicate that anilingus is a rare sexual practice between women.

Anilingus can involve a variety of techniques to stimulate the anus, including kissing or licking; it may also involve the tongue moving around the edge of the anus or up and down the insides of the cheeks of the , and in and out of the anus.

Anilingus can be performed in a number of sex positions including:

Anilingus has potential health risks arising from the oral contact with human feces. Diseases which may be transmitted by contact with feces include: bacterial diseases including shigellosis (bacillary dysentery); viral systemic diseases including hepatitis A, hepatitis B, hepatitis C, poliomyelitis, human papillomavirus (HPV) and herpes simplex virus; parasites including intestinal parasites; and infections and inflammations chlamydia infection, gastroenteritis, conjunctivitis, gonorrhea, lymphogranuloma venereum and other sexually transmitted infections.

...
Wikipedia