The male’s penis becomes erect and the Cowper’s glands secrete drops of fluid. The female’s clitoris becomes erect and the vagina becomes wet. The nipples become erect, the skin flushes, muscles tense, breathing speeds up, the heart beats faster, and blood pressure rises.
The male’s testicles are withdrawn up into the scrotum. The female’s clitoris becomes sensitive and retracts to avoid direct stimulation from the penis. Breathing, heart rate and blood pressure continue to increase. Muscle spasms may begin. Tension in the muscles increase.
“In males, orgasm is a two-stage process: emission and expulsion. Emission involves contractions of the vas deferens, the seminal vesicles, the prostate, and the external and internal urethral sphincters.