Sex protects the prostate

Compared with men who have had only one sexual partner during their lifetime, those with a score of more than 20 conquests have a 28% reduced risk of being diagnosed with the disease. 

But the same is not true for gay encounters, according to the Canadian scientists. In fact, having more than 20 male partners doubled the risk of prostate cancer.

The findings are from the Prostate Cancer & Environment Study in which 3208 men answered questions about their lifestyle and sex lives.

Lead researcher Professor Marie-Elise Parent, from the University of Montreal, said: "It is possible that having many female sexual partners results in a higher frequency of ejaculations, whose protective effect against prostate cancer has been previously observed in cohort studies."

The study found that men who were virgins were almost twice as likely to be diagnosed

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