OK, guys...time to get serious.
Most of the responses so far are what I expected: disbelief that masturbation could possibly lead to prostate cancer; discussion about the small sample size in the study; and comments on sensational journalism.
In defense of WebMD, it is the most widely read on-line health site and it leans more to medical science than journalism. All articles published by WebMD are reviewed by medical professionals before publication. The report on Masturbation and Prostate Cancer Risk is based on a survey of men in the UK; it is not a medical study. The causes of prostate cancer are well known; certainly more study is required to determine if masturbation may be a cause.
Risk factors for prostate cancer include age, race, diet, family history, and a sedentary lifestyle. Researchers may eventually add excessive youthful masturbation to the list. When a man has prostate cancer, testosterone is the enemy. Testosterone actually promotes the growth of prostate cancer. This fact brings the masturbation question into greater significance; a scientific study is needed to determine if there is a causal relationship. The results of a study may show only that men with a higher sex drive have more testosterone and a greater risk for prostate cancer.
Forty years would be good for today's teenagers; not many of them will be diagnosed with prostate cancer before then. And a lot of progress is being made including current clinical trials on a vaccine which, if approved, will help promote the body's natural immune system to fight cancer. Currently surgical removal of the prostate and radiation can cure the disease, but they are not always successful even when used in combination. When they fail, the only remaining treatments are those which reduce testosterone production in an effort to slow the progression of the cancer.
That's a great question, Drew. The majority of men will have prostate cancer in their lifetime. In fact, 80% of men who live to age 80 will have prostate cancer. Prostate cancer screening is recommended for men beginning at age 50. If you are in a high risk group, you should start having an annual PSA test at age 40. It is a simple lab test performed on a blood specimen. You're having blood drawn anyway...be sure to request a PSA (prostate specific antigen) test. If your father, brother, either grandfather, or any uncle has ever been diagnosed with prostate cancer, you should start testing at age 40.
For the man diagnosed in his 70s or 80s, doctors will usually recommend deferring any treatment. At this age, prostate cancer usually progresses slowly so that the patient is likely to die from some other cause. The man diagnosed in his fifties potentially has a long road to travel.
Unfortunately, the majority of men who have prostate cancer don't know it. That is changing because routine screening is now common. Of course, those men who never have a physical will never know. If you are 50 or older (40 or older in a high risk group) make sure you get an annual PSA test. Younger men...think about you fathers.
Sorry to be so long winded about the subject, but it is important to me and to you. Hope I haven't spoiled your fun.