Retrieved July 23, The anus has a relatively high concentration of nerve endings and can be an erogenous zonewhich can make anal intercourse pleasurable if performed properly. Genitourinary system Kidney Ureter Bladder Urethra. The pudendal nerve that branches to supply the external anal sphincter also branches to the dorsal nerve of the clitoris and the dorsal nerve of the penis. The internal anal sphincter an involuntary muscle responds to the pressure by relaxing, thus allowing the feces to enter the canal. It is not to be confused with Bunghole.
Anal stretching or fisting is pleasurable for some, but it poses a more serious threat of damage due to the deliberate stretching of the anal and rectal tissues; its injuries include anal sphincter lacerations and rectal and sigmoid colon rectosigmoid perforation, which might result in death.
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Relaxation of the internal and external anal sphincters allows the feces to exit from the anus, finally, as the levator ani muscles pull the anus up over the exiting feces. The Orgasm Answer Guide. Retrieved July 23, The posterior aspect of the rectum and anus exposed by removing the lower part of the sacrum and the coccyx. The inner sphincter is involuntary and the outer is voluntary.