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Compared to men who have had only one partner during their lifetime, having sex with more than 20 women is associated with a 28% lower risk of one day being diagnosed with prostate cancer, according to researchers at the University of Montreal and INRS — Institut Armand-Frappier. However, having more than 20 male partners in one’s lifetime is associated with a twofold higher risk of getting prostate cancer compared to those who have never slept with a man.
Marie-Elise Parent and Marie-Claude Rousseau, professors at university’s School of Public Health, and their colleague Andrea Spence, published their findings in the journal . The results were obtained as part of the Montreal study PROtEuS (Prostate Cancer & Environment Study), in which 3,208 men responded to a questionnaire on, amongst other things, their sex lives. Of these men, 1,590 were diagnosed with prostate cancer between September 2005 and August 2009, while 1,618 men were part of the control group.
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