During sexual stimulation, the nerves produce chemicals that improve blood flow to the penis. Blood is pumped into the two spongy muscular erection chambers of the penis from the corpus cavernosum. During an erection, the spongy tissues become loose and catch the blood. The muscle tissues of the penis contract due to the second set of nerve signals that pass through it during orgasm, allowing blood to return to the circulatory system and dissolving the erection.
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