Anilingus

Anal-oral contact, also referred to as anilingus and colloquially known as rimming, rimjob, tossing the salad or 87 (compare 69), is a sexual activity involving contact between the anus or perianal areas of one person and the mouth of another. It was referred to also as the "black kiss." Anilingus (commonly misspelled as "analingus") is thus simultaneously anal sex and oral sex. It should be contrasted with anal sex followed by fellatio, which is often referred to as ass to mouth (arse to mouth in British English), A2M, ATM or A2OGM, which is in effect anal-oral contact at one remove.
Culture
Anilingus can be practiced by humans of all sexual orientations. In both sexes, the human anus contains pleasurable nerve endings, similar to those found in the genitalia. One person often runs his or her tongue around the rim of the anus; hence the terms, rimming and rimjob. Frequently, for added pleasure, and to loosen up the anus for anal sex, the tongue is inserted into the sphincter muscle of the anus.
Health risks
From a health standpoint, anilingus may carry serious risks because of the presence of bacteria on or in the anus or rectum. Unprotected anilingus involves the risk of contracting sexually transmitted diseases, such as Genital Herpes or intestinal parasites.
Public notoriety
The Starr Report on the Lewinsky scandal made mention of anilingus between President Bill Clinton and intern, Monica Lewinsky. [1]
References to anilingus were made in the American sitcom, Sex and the City, where the restrained main character Carrie uses the euphemism tuchus lingus, and in the first several minutes of the first episode of the British sitcom, Queer as Folk. It is also mentioned in the movie South Park: Bigger, Longer and Uncut as a rimjob.
Reference to "tossing the salad" is made in Chris Rock's comedy routine, Tossed Salad Man, and in Kevin Smith's Jay and Silent Bob Strike Back.
A reference to the "rusty trombone" (a sexual position in which a man receives anilingus and is masturbated simultaneously) is made by the character "Mooj" in the 2005 movie The-40-Year-Old Virgin.
Prevalence in pornographic videos
Anilingus became something of a fad around 2003 or 2004 in United States straight pornographic videos, but has been commonly found on international gay videos for considerably longer.