I thought this was quite interesting...
Frequent masturbation may help men cut their risk of contracting prostate cancer, Australian researchers have found. It is believed that carcinogens may build up in the prostate if men do not ejaculate regularly, BBC News reported on Wednesday. The researchers surveyed more than 1,000 men who had developed prostate cancer, and 1,250 men who had not. They found that men who had ejaculated the most between the ages of 20 and 50 were the least likely to get cancer. Men who ejaculated more than five times each week were a third less likely to develop prostate cancer.
Sexual intercourse may not have the same effect because of the higher risk of contracting a sexually transmitted disease, which could in turn raise the risk of cancer. "Had we been able to remove ejaculations associated with sexual intercourse, there should have been an even stronger protective effect of ejaculations," Graham Giles of the Cancer Council Victoria, who led the researchers, said in the article.
The prostate produces a fluid that is incorporated into ejaculation, which activates sperm and prevents them from sticking together. Studies on animals have shown that carcinogens like 3-methylchloranthrene can be harbored in the prostate. Frequent ejaculation encourages the cancer-inducing fluids to "flush out." (The Advocate)
Source
http://news.yahoo.com/s/po/20080421/co_po/masturbationmaypreventprostatecancer;_ylt=AiAHQnzGaaWkrKKnf0Ac0e.s0NUE
