Sensory nerve endings in the peroneus tertius muscle of the ass and horse: a histology*; Male; Muscles/innervation*; Nerve Endings/anatomy & histology.
The human anus is the external opening of the rectum. Two sphincters control the exit of feces The anus has a relatively high concentration of nerve endings and can be an erogenous zone, which can For a male insertive partner, the tightness of the anus can be a source of pleasure via the tactile pressure on the penis.
The male sexual organs. Anal masturbation is an erotic stimulation focusing on the anus and rectum. For humans Pleasure can be derived from anal masturbation due to the nerve endings in the anal and rectal areas. Orgasmic function.