Anal sex
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http://en.wikipedia.org/wiki/Anal_sex
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Anal sex most often refers to the sex act involving insertion of the penis into the anus. The term anal sex can also sometimes include other sexual acts involving the anus, including Anal–oral sex, fingering, and object insertion. As the rectal mucous membrane provides little natural lubrication, a personal lubricant is most often required or preferred when penetrating the anus.

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