Many men have taught themselves to enjoy multiple orgasms by delaying ejaculation through control of the pubococcygeus muscle, a technique that takes some practice, but a rare breed of man apparently can have multiple orgasms -- each including ejaculation -- without training. Three years ago a 35-year-old man contacted Beverly Whipple, a sex researcher at Rutgers University, claiming he could come repeatedly without any recovery period, and he agreed to demonstrate. Whipple and her colleagues monitored the man's heart rate, pupil dilation and ejaculate volume as he masturbated to a video of his favorite porn scenes.