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Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a persons anus, or anus and rectum, for sexual pleasure. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus (), and pegging. Although anal sex most commonly means penileanal penetration, sources sometimes use anal intercourse to. Though resting sphincter tone is predominantly attributed to the internal anal sphincter, studies under general anesthesia or after pudendal nerve block suggest the external anal sphincter generally accounts for approximately 25, and up to 50, of resting anal tone. 9, 33, 40, 50, 144, 170 when continence is threatened, the external sphincter contracts to augment anal tone, preserving continence. Anal penetration can be pleasurable, but it can also be a source of physical discomfort. The muscle on the outside of the rectum, called the anal sphincter, ordinarily tightens if stimulated, which means that attempts at insertion of the penis, or even a finger, may be uncomfortable even if done slowly and gently. The internal anal sphincter, ias, (or sphincter ani internus) is a ring of smooth muscle that surrounds about 2. 0 cm of the anal canal its inferior border is in contact with, but quite separate from, the external anal sphincter. It is about 5 mm thick, and is formed by an aggregation of the involuntary circular fibers of the rectum.   anal sex is a bit of a taboo subject, despite the fact that its an increasingly popular sexual activity. As more couples explore this type of sex, understanding the risks, rewards, and proper. These devices are designed to help your anal sphincter and rectal muscles adjust to penetration. The key is to use them in increasing increments so your muscles have time to adjust.   when the muscle is tight, anal penetration can be painful and difficult. Repetitive anal sex may lead to weakening of the anal sphincter, making it difficult to hold in feces until you can get to.

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