This article is about anal sex in human sexual behavior. For anal sex in other animals, see
Animal sexuality. Anal sex is a form of
human sexual behavior. While there are many sexual acts involving the
anus, anal cavity, sphincter valve and/or
rectum, the term anal sex is often restricted to anal intercourse: the
insertion of the erect
penis into the rectum. It is a form of sexual behavior considered to be comparatively high in risk, due to the vulnerability of the tissues and the septic nature of the anus.
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