Nude #44
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also known as Asshole, Sphincter

MEDICAL DEFINITION:  The terminal end of the digestive system. It is the last inch or so of the rectum, composed of two circular sphincter muscles. In its normal state, the anus is closed tightly. During elimination of feces, the sphincter muscles relax, and the anus opens to allow passage of stool.

SEXUAL DEFINITION: The entry for anal sex.