Spanking the Monkey('s Brain)

It was found that in male monkeys there were separate systems for erection, for ejaculation, and for orgasm. With an electrode in the separate orgasm system, the monkey would stimulate this region and go through total orgasm without erection and without ejaculation. Given the apparatus by which he could stimulate himself once every three minutes for twenty-four hours a day, the monkey stimulated himself once every three minutes for sixteen hours and then slept eight hours and started again the next day.

John Lilly, The Scientist

Ass Full of Cum . Chimps . Baboons