In humans , the anus from Latin anus meaning "ring", "circle"   is the external opening of the rectum. Two sphincters control the exit of feces from the body during an act of defecation , which is the primary function of the anus. These are the internal anal sphincter and the external anal sphincter , which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning. The inner sphincter is involuntary and the outer is voluntary.
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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. The term anilingus entered English through the F. Rebman translation of Edition 10 of sexologist Richard von Krafft-Ebing 's book Psychopathia sexualis. Pleasure for the giver during anilingus is usually based more on the principle of the act. 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.
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Last Updated: March 29, References. Nelson is a Veterinarian who specializes in Companion and Large Animal Medicine in Minnesota, where she has over 18 years of experience as a veterinarian in a rural clinic. This article has been viewed 34, times. Excessive licking among older dogs could be a result of a number of different conditions.