You hear very often that it is important to ejaculate at least once or even 5-6 times per week to decrease the risk of prostate cancer. They say that men who ejaculate less than twice per week are more likely to develop prostate cancer by the age of 70. They say you should be jerking off 15-25 times per month depending on your age. Absolute rubbish. Lack of ejaculation does not lead to prostate cancer. My theory is this - Men who ejaculate less frequently do so because they are unable to ejaculate. They lack libido, testosterone and vitality which is the reason they are not ejaculating. These generally overweight, unhealthy men probably also drink a bit and smoke a bit which all result in this lack of vitality. Maybe they eat unhealthily too and seldom exercise. These same men then develop all different kinds of different diseases at earlier rates, including prostate cancer. The men ejaculating frequently are (likely) men who are in a fulfilling relationships. Maybe they are very good with women. Maybe they workout 4 times a week, they avoid cigarettes and other drugs. They keep alcohol to a minimum and try to only eat meat,vegetables and other necessities. These men live to be 90 years old. Their testosterone is high and they are fit and healthy. It is not purely the ejaculating that gives these men a lower risk of prostate cancer. It is everything else that goes with it. It is not purely the act of ejaculating that lowers their risk, but their health and vitality that makes them desire to ejaculate so frequently. Sorry if I have explained that poorly. I sometimes struggle to convey my thoughts. TL;DR: The ability to ejaculate regularly helps to avoid prostate cancer. Not the actual act of ejaculating itself. Men who don't ejaculate because they lack the vitality, then develop prostate cancer and every other type of illness at higher rates than men who are actually able to ejaculate. You don't actually HAVE TO ejaculate. Just the fact that you are able to have sex frequently is what reduces the risks of getting ill.