No, on the contrary, the reports are saying to use or lose it! In other words, keeping sexually active throughout your life (not just under 40 but continually through golden years)helps to keep the prostate healthy. Also, masturbation won't cause blindness either! lol ;) Good luck!

Prostate cancer and any cancer for that matter is very complex. There is not a single cause. There are things that make it more likely to get prostate cancer. There are fairly recent studies that show men who ejaculate more frequently than average are less likely to get prostate cancer.

The best information available points to a primary cause of prostate cancer being excess estrogen. Men and women both need estrogen, but men need less. Our current environment and our food chain are full of unnatural estrogenic substances, that promote the increase of prostate cancer in men and Breast Cancer in women. Pesticides and plastics contain estrogenic substances. Most all conventionally raised beef have estrogen implants to speed up weight gain. There is a significant debate as to whether the phytoestrogens found in soy products are harmful or helpful. We have bred our dairy cows to be more and more estrogenic over the past 75 years in particular, leading to higher and higher levels of estrogen in dairy products.

Another correlated factor (not necessarily causal) is zinc levels. High zinc levels are correlated with higher levels of prostate cancer as are low levels. Balance is the key. Semen is high in zinc. Think that through. Perhaps if you ejaculate infrequently, you will have high levels of zinc, particurly if you eat zinc rich foods. Perhaps if you ejaculate a lot, you will have low zinc levels, particularly if you eat few zinc rich foods. Perhaps balance is good. The studies show that on average, men who ejaculate the most are less prone to prostate cancer. That suggests that the average American male is not ejaculating frequently enough. What is the right frequency? I dunno. I suspect it is several times each week. The studies that I have read suggest that 4-7 times a week is in the good range, but I wouldn't hang my hat on it...

I suspect you will need to figure out what is best for you as an individual.

Cancer tends to live in fertile areas like the prostate. If we knew the exact cause, we would cure it. Frequent doctor examinations many times help reduce cancer by catching it when it's small. Masturbation/sex acts/ intercourse help reduce harmful carcinogens that COULD cause cancer.
So, if you are not having frequent intercourse or sexual acts, you should be masturbating regularly, contrary to any religious or moral hangups you might have, and in private.. Masturbation doesn't hurt anything and will not cause hairy palms either. You should make it a point to spend some time, use lubrication and bring yourself to a full orgasm for a good cleaning. The only time it's bad is when you are caught by someone doing it who just doesn't understand or it takes the place of other stuff you should be doing like homework or sports. Right time and place.
Most modern sex therapists recommend masturbating at least 2 to 3 times a week to stay healthy. The actual amount you masturbate is up to you...there is a point of too much where desensitization takes place.... where the nerves can be overstimulated and the penis appears not to be working right. But, the good news is it all comes back with a little rest. A lot could also make you very tired too...so don't go "nuts" with it!

This is an approximate copy of that article:
The latest research says that frequent self-pleasuring could protect young men against the most common kind of cancer
IT WILL make you go blind. It will make your palms grow hairy. Thankfully, such myths about masturbation are largely a thing of the past. But the latest research has even better news for young men: frequent self-pleasuring could protect against the most common kind of cancer.

A team in Australia led by Mr. Graham Giles of The Cancer Council Victoria in Melbourne asked 1079 men with prostate cancer to fill in a questionnaire detailing their sexual habits, and compared their responses with those of 1259 healthy men of the same age. The team concludes that the more men ejaculate between the ages of 20 and 50, the less likely they are to develop prostate cancer.

The protective effect is greatest while men are in their twenties: those who had ejaculated more than five times per week in their twenties, for instance, were one-third less likely to develop aggressive prostate cancer ...
He suggests lubing up and start masturbating.

Excellent posts from 7320 and 33045! My husband has been saying for years that masturbation and frequent sex is key to prostate health, but I didn't really know why (I just thought he was horny!lol) Seriously, those were great posts and that is what this forum is about! Keep it up! Uh,..er, I mean,keep up the good work!! :)

2 years ago I had a problem, I believe it was around the prostate or so. It than left, last year it came back and I went to the hospital, to cut the story short the doctor told me that I basically need to ‘clean the pipe’ more often, whether by having sex or masturbation.

Well, I started doing that and so far I haven’t had any pain thank God *knock on wood*. I think I usually do it 3 or 4 times a week. The thing with me is, I get aroused easily by the simplest things. I could be on the bus and a sexy lady passes by, I use my imagination and bam, I’m horny. So it kind of builds up and is bad to keep it in as the Doc says lol. I suppose you can say I have a high sexual drive so I need to do this or I’ll be in pain. I think that also has been a major problem for me hair wise, my hormones are pretty crazy I'd say and started to lose my hair at 20 or so... might have to get on Proscar or something.

Glad to know it's healthy though because If I don't do it I'll be in pain so at least I know it's safe now.