What are the healthy benign reasons for masturbation?

Dr. Oz: All right, Twenty-one times a month, will reduce your chance of prostate cancer by thirty three percent.

Prostate Cancer is an ailment that almost all men will get before they die. I think this is shocking Phil, this may blow your mind but I'm gonna say it right now. Twenty-five percent of men in their 70's and 80's are having sex all they want. Twenty-five percent - If you're going to show a one third reduction in any kind of cancer I mean, chemotherapy doesn't give you that.