Pederastic practices in historic Greece , no less than in Athens and Sparta, have been expected to avoid penetrative sex of any type. Intercrural sex was not considered penetrative and two males participating in it was thought of a “clean” act. In a 2010 clinical evaluation article of heterosexual anal sex, anal intercourse is used to particularly denote penile-anal penetration, and anal intercourse is used to denote any form of anal sexual activity. Indirect stimulation of the clitoris through anal penetration may be attributable to the shared sensory nerves, particularly the pudendal nerve, which gives off the inferior anal nerves and divides into the perineal nerve and the dorsal nerve of the clitoris. Although the anus has many nerve endings, their purpose just isn’t specifically for inducing orgasm, and so a lady attaining orgasm solely by anal stimulation is uncommon. As with most forms of sexual exercise, anal sex participants threat contracting sexually transmitted infections . Anal sex is taken into account a excessive-danger sexual follow because of the vulnerability of the anus and rectum.