There's a long standing body of medical "knowledge" that men who have "too much sex" or higher than average levels of sexual activity are at greater risk of prostate cancer. Prostate cancer is fairly scary, besides being way too close to the family jewels, it frequently affects men over 50, causing pain, difficult urination, and erectile dysfunction... and until you get the blood test, you probably won't even know that you have it, and it can spread to other systems. Clearly, we live in a society where sexual pleasure for the sake of sexual pleasure is frowned upon big-time, because if we go around just enjoying ourselves we won't know whose babies are whose so we know whose property is whose (and who belongs to whom), and we won't want to go to heaven if we're having too much fun here on earth, will we? Blaming sex for disease is as American as Kellogg's cornflakes and Graham crackers, which were invented by John Harvey Kellogg and Sylvester Graham, respectively, who blamed everything from tuberculosis to mental disease on masturbation and having sex more than once a week. In fact, Kellogg's cornflakes and Graham crackers were invented in order to decrease libido and squelch desire so that you would have sex less often and 'be healthier'. Historically anything horrible that could be attributed to "too much sex" often was, and sometimes still is. Hairy palms, anyone? Please.

Now, whatever the white-coats believed, it wasn't 'scientific' just to say, "God got you", so there were two basic sex-causes-prostate-cancer theories:
1. Higher levels of male hormones causes you to have more sex, and doctors believed that high hormone levels were linked to cancer.
2. Perhaps these guys with high levels of sexual activity were out there catching some "prostate-cancer-causing pathogen", but so far so such cootie has been discovered.

In fact there was a big study done in 2002 that linked higher levels of sexual activity with prostate cancer, however because the studies they analyzed primarily featured subjects that had already been diagnosed and treated for prostate cancer, it's possible that these guys 'remembered' having more sex than they were actually having at the time which was probably way more sex than they were having now, not just 20/20 but magnifying their sexual past.
The most recent study, conducted by researchers from the National Cancer Institute, John Hopkins, and Harvard, had a HUGE sample size = 29,342... and when we are talking statistical validity, sample size *does* matter - plus it matters what you do with it *ahem* anyway, they followed these 29,342 so far prostate-cancer-free men, aged 46 to 81, for eight years.

At the beginning of the 8-year study, they were questioned about the number of ejaculations (sexual intercourse plus masturbation and nocturnal emissions) they had, per month, between the ages of 20 to 29, then between the ages of 40 and 49, then in the last year. Then, every two years, these 29,342 men were asked if they had developed prostate cancer. By the end of the eight year study, about 5% of them did... but GUESS WHAT!? - the group of men with the highest frequency of ejaculation were less likely to have developed prostate cancer. In fact, three more ejaculations per month across the man's lifetime was associated with a 15% decrease in the risk of prostate cancer. So the more ejaculations you have had, the less likely you are to develop prostate cancer. When just considering the cases of prostate cancer confined only to the prostate, the correlation was even stronger, every three more ejaculations per month across the lifetime, was associated with a 90% decrease in the risk of prostate cancer. Now, in both these cases there was a statistical suggestion that men in the very lowest ejaculation frequency group of 0-3 per month also had somewhat lower risk, when compared to those with frequency of 4-7 per month. So there was some suggestion that in the very, very lowest group there might have been less risk of prostate cancer. But overall, looking at men who were consistently in the highest ejaculation frequency group – that is, 21 or more ejaculations per month, over the period studied – as compared to all the men who consistently reported frequencies of 0-20 ejaculations, those with the most ejaculations showed the lowest risk of developing prostate cancer. So not only is ejaculation fun, it reduces your risk of prostate cancer.
Take two and call me in the morning. ..
Remember, you are "shooting for" at least 21 times per month here. Better get to it.
Love and laughter...
:) Monika