"Overall, an average of 21 or more ejaculations a month during a man's lifetime decreased the risk of prostate cancer later in life by 33%. And each increase of three ejaculations per week during a man's lifetime was associated with a 15% reduction in prostate cancer risk."
I think most of the members here are way ahead of the 21 per month. We could probably afford to take a month off and still be in good shape.