Your anus is located on your backside, between your butt checks. Your anus is closed off by two rings of muscle: the internal anal sphincter and the external anal sphincter. Around the anus there are 'corpora cavernosa' or masses of erectile tissue that prevent moisture and air from escaping unintentionally. The anus is the last part of the rectum. It is closed off by two rings of muscle called sphincters.
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To begin, put a generous amount of water-based lube on one or two fingertips make sure you replenish the lube often and gently massage the area around the outer rim. Once he's riled up, test the waters by gently sliding just the tip of your middle finger inside. If he clenches his sphincter muscles, which encircle the anal opening, pull your finger out and continue rubbing the outer area to help reduce his tension. Then, try to insert your fingertip again.
Anal sex or anal intercourse is a form of human sexual behavior. It is a form of sexual intercourse considered to be particularly risky, for a number of reasons related to the vulnerability of the tissues and the septic nature of the anus. Such relations have been documented in a wide range of cultures, from earliest times.
Why do men love anal sex? Every guy I've dated has requested anal at some point, even to the point of begging. This experience seems to be ubiquitous in heterosexual relationships.