Anal sex can be an important risk factor for the relay of many diseases. <ref>http://www.springerlink.com/content/jx13231641717w48/</ref><ref>http://www.cdc.gov/hiv/resources/qa/qa22.htm</ref><ref>http://www.mask.org.za/article.php?cat=news&id=665</ref><ref>http://content.nejm.org/cgi/content/full/331/25/1717</ref> According to the Center for Disease Control: "In general, the person receiving the semen is at greater risk of getting HIV because the lining of the rectum is thin and may allow the virus to enter the body during anal sex."<ref>http://www.cdc.gov/hiv/resources/qa/qa22.htm</ref>
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Anal sex can be an important risk factor for the relay of many diseases. <ref>http://www.springerlink.com/content/jx13231641717w48/</ref><ref>http://www.cdc.gov/hiv/resources/qa/qa22.htm</ref><ref>http://content.nejm.org/cgi/content/full/331/25/1717</ref> According to the Center for Disease Control: "In general, the person receiving the semen is at greater risk of getting HIV because the lining of the rectum is thin and may allow the virus to enter the body during anal sex."<ref>http://www.cdc.gov/hiv/resources/qa/qa22.htm</ref>