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.
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The human anus from Latin anus meaning "ring", "circle"   is the external opening of the rectum. Two sphincters control the exit of feces from the body during an act of defecation , which is the primary function of the anus. 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.
Does anal really feel that much better than vaginal sex? I found that for gay men, their physical experience of anal sex paralleled that of vaginal sex for women. The male sexual organs. Anal masturbation is an erotic stimulation focusing on the anus and rectum.