Gray's anatomy for students. In addition to nerve endings, pleasure from anal intercourse may be aided by the close proximity between the anus and the prostate for males, and vagina , clitoral legs and anal area for females. The anus is also the site of potential infections and other conditions, including cancer. These are the internal anal sphincter and the external anal sphincter , which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning. Gender binary Gender identity Men who have sex with men Sexual identity Sexual orientation Women who have sex with women.
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