There's no set amount of time men should ejaculate in order to reduce prostate cancer.

What you posted is based on results of a research that found that men that ejaculated 21 times and above per month, had 31% lower risk of getting prostate cancer.

There's still a risk"

Prostrate Cancer is a dangerous disease condition that affects men.

The cancer is usually in a man's prostate, it is like a small walnut-sized gland that produces seminal fluid.

A man's prostate is what produces the seminal fluid that nourishes and also transports the sperm.

The treatment of this requires surgery, hormone therapy or chemo therapy sometimes. Depending on the severity.