Have more sex: it's good for you

Oxytocin -- a hormone released during sexual arousal, orgasm and breast-feeding -- has been linked to reduced risk of breast cancer. And not just for women: A small, 2000 study of 23 Greek men found that those with breast cancer tended to have a history of fewer orgasms than did healthy men in the control group.

From http://factlets.info/Orgasms

I think this pretty much speaks for itself.