Back in 2004, a study on the effects of ejaculation on the risk of developing prostate cancer was performed, to much fanfare. The highly popular results of that study, which found that frequent ejaculation meant a lowered risk for developing the disease, were perceived as a ringing endorsement for copious sexual activity. 

Now there's even more good news for men everywhere. Another, more exhaustive study has been performed on the same topic, and the results from the 2004 study have been confirmed. The study found that men who ejaculated more than 21 times a month were significantly less likely to develop prostate cancer than those who did so four to seven times. The results were the same whether the men ejaculated with the help of a partner or without, reports the American Urological Association

"After controlling for potential confounders, higher monthly ejaculation frequency was associated with a statistically significant decreased risk of total prostate cancer compared to the reference group at every time period," wrote the study's authors.

The new study, which extended the research period from eight to 18 years, followed nearly 32,000 men. Of those men, 3,839 were diagnosed with prostate cancer, and 384 have died as a result. It was found that adults with lifetime averages of ejaculating over 21 times a month had their cancer risk reduced by a third.

The reason for the results has not yet been determined, but it's possible that the release of beneficial hormones during orgasm is a factor. Frequent flushing out of the prostate could also keep things clean and operating efficiently.

Researchers were also able to investigate the association between ejaculation frequency and a medley of other factors, with some interesting results.

"Ejaculation frequency was inversely associated with age, but positively associated with BMI, physical activity, divorce, history of sexually transmitted infection, and consumption of calories and alcohol," it was reported.

The only unfortunate news was that the deadliest forms of prostate cancer, as opposed to milder or "low-grade" forms, were unaffected by the frequency. But let's not quibble. Overall, the exhaustive study has established that frequent sexual activity, with or without a partner, is good for you. 

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Bryan Nelson ( @@brynelson ) writes about everything from environmental problems here on Earth to big questions in space.

Confirmed: Frequent ejaculation reduces cancer risk
Study found that men who ejaculated more than 21 times a month were significantly less likely to develop prostate cancer.