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Frequent sex staves off prostate cancer.

That’s the good news, but not any kind of frequent sex. According to a Montreal study made public Tuesday, sleeping with several women — more than 20, to be exact — has a protective factor.

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It is associated with a 28-per-cent lower risk of one day being diagnosed with prostate cancer, according epidemiologist Marie-Élise Parent and her team of researchers at the Université de Montréal and INRS — Institut Armand-Frappier.

There are only “highly speculative” hypotheses at this point, said Parent, the lead researcher. One theory, supported by previous studies, suggests that men who ejaculate frequently are less likely to develop prostate cancer.

“A new partner over time keeps one active over the years,” Parent said. “So the presumption is that men with several partners were exposed to more ejaculations. That’s one explanation for our findings.