From an article at CBC.ca: "Scientists in Australia determined that men in their 20s who ejaculated more than five times a week were a third less likely to develop aggressive prostate cancer later in life. The study suggests ejaculation by means of masturbation provides better protection than ejaculation in sexual intercourse because men can pick up infections from intercourse that actually increase the risk of getting prostate cancer."
That is all. Please continue...uh...whatever it was you were doing. Nudge nudge, wink wink ;)