We posted a urologist’s advice on prolonged chastity and whether or not prostate milking is necessary a while ago.

A 2004 study found that the more often men ejaculated, the less likely they were to get cancer, while some things should be avoided. The sample of this study (with many participants under 50 years old) made it hard to gauge the reliability of the results.

IFLScience! reports that a follow-up study by Harvard T.H. Chan School of Public Health has extended the study and recently presented the results of their research.

Men who ejaculated more than 21 times a month were significantly less likely to develop prostate cancer than those who did so 4-7 times. For those with a (adult) lifetime average above 21 times a month, cancer risk was reduced by a third.

The bad news is that regular enjoyment doesn’t have a measurable effect on the most deadly forms of prostate cancer, instead reducing the “organ-confined and low-grade” cancer risks.

If you’re good at understanding statistics, the actual numbers are here.