Prostate cancer is one of the main malignant tumors which harass aged men. In the US, one tenth of men is said to suffer from this disease. Asian people are less likely to get prostate cancer compared to black and white. But, the prevalence rate of patients is rapidly increasing recently in Japan, perhaps due to Westernized diet style. Fortunately, prostate cancer is relatively easy to treat. It progresses so slowly that some people need no intervention to prevent premature death.
Some risk factors of onset of prostate cancer are identified. Excessive milk drinking is considered to be a risk. Calcium is also likely to make prostate cancer. Then, how is the relationship between prostate cancer and behaviors relevant to the role of the prostate? Recently, researchers investigated the influence of ejaculation on the onset of prostate cancer.
The result was clear. The more frequently you have an ejaculation, the more certainly your prostate is free from cancer. A cohort study subjected more than 30,000 men for 20 years revealed an inverse correlation between them.
Pubmed: Ejaculation Frequency and Risk of Prostate Cancer: Updated Results with an Additional Decade of Follow-up.
However, you should be cautious about interpreting this result. According to this study, you have to ejaculate 21 times in a month in the 50s to reduce the risk of prostate cancer by 20 %. If I accomplish the frequency, I will get some other disease because of exhaustion.
Of course, this study shares a weakness as well as other cohort studies. Some confounding factors are possible. Men with a low frequency of ejaculation are likely to have some problems in their health, which are potential risks for prostate cancer. Recognizing it, the authors excluded the subjects who have an extremely low frequency of ejaculation. However, it is uncertain how many times of ejaculation is the standard for an aged man. It is still not sure artificially increased the frequency of ejaculation will protect you from prostate cancer.
Avoiding milk sometimes is preferable as prevention, I think.