Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anusor anus and rectumfor sexual pleasure.
While anal sex is commonly associated with male homosexualityresearch shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. Anal sex is considered a high-risk womens practice because of the vulnerability of the anus and rectum.
The anal and rectal tissues are delicate and do not provide lubrication like the vagina doesso they can easily tear and permit disease transmission, especially if a personal lubricant is not used.
Strong views are often expressed about anal anal.
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It is controversial in various cultures, especially with regard to religious prohibitions. This is commonly due to prohibitions against anal sex among males or teachings about the procreative purpose of sexual activity.
Womens abundance of nerve endings in the anal region and rectum can make anal sex pleasurable for men or women. An Encyclopedia states that "the inner third of the anal canal is less sensitive to touch than the outer two-thirds, but is more sensitive to pressure" and that "the rectum is a curved tube about eight or nine inches long and has the capacity, like the anus, to expand".
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Research indicates that anal sex occurs significantly less frequently than other sexual behaviors,  but its association with dominance and submissionas well as taboomakes it an appealing stimulus to people of anal sexual orientations. In a male receptive partnerbeing islamic porno penetrated can produce a pleasurable sensation due to the inserted penis rubbing or naked girl manikin against the prostate through the anal wall.
Stimulation from anal sex can additionally be affected by popular perception or portrayals of the activity, such as erotica or pornography.