Prostate cancer is the most common form of cancer in men over 75. It occurs when cells of the prostate mutate and begin to multiply out of control. These cells may then metastasize from the prostate to other parts of the body, usually the bones and lymph nodes. It can lead to pain, incontinence, erectile dysfunction, and death.

That's why it's so important for men in their 20s and 30s to take steps to protect themselves against prostate cancer later in life. What are some of those steps? Well, one happens to be regular ejaculations. The Australian Cancer Council found that ejaculating more than five times a week in your 20s and 30s reduces the risk of prostate cancer later in life. Interestingly enough, the report states that masturbation is more effective than relying on sex alone, presumably because most men aren't getting this lucky this often.

Obviously, there are other factors (diet, exercise, etc.) that can also affect a man's chances of prostate cancer. Otherwise, if all it took to stave off prostate cancer was masturbating while you're young, it should almost be cured by now -- because, in a recent national study, 95 percent of men reported having masturbated.

My guess is that the other five percent didn't have arms.