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Anal Anatomy Two closely spaced muscle rings, called sphincters surround the anal opening. The outer sphincter is controlled like any muscle, you can contract or relax it at will. The inner sphincter is goverened involuntarily and it responds to fear and anxiety, causing the receiving partner to tense up the inner sphincter. You can learn to control the inner sphincter by inserting a finger into the anus while in the shower and concentrating on the muscle group. Richly endowed with nerve endings, the anus is also interconnected with the pelvic muscles and is known to contract rhythmically during orgasm.