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Sleeping with more than 20 women in a lifetime linked to lower prostate cancer risk

The research team, from the University of Montreal's School of Public Health in Canada, publish their findings in the journal Cancer Epidemiology.

According to the researchers, the link between sexual activity and prostate cancer risk remains controversial. Some studies have associated high sexual activity with a greater risk of the disease, while others have suggested the opposite.

In this study, the team set out to determine whether the number of sexual partners men have throughout their lifetime influences their risk of prostate cancer.

They analyzed 3,208 men who were part of the Prostate Cancer & Environment Study (PROtEuS) in Montreal, Canada. Of these, 1,590 were diagnosed with prostate cancer between 2005 and 2009, while the remaining 1,618 men were free of the disease.

As part of this study, all men were required to complete a questionnaire that asked about their sexual activity, as well as sociodemographic, environmental and lifestyle factors.

28% lower prostate cancer risk among men who slept with more than 20 women

The team was not surprised to find that men who had a relative with prostate cancer were twice as likely to have the disease themselves. A family history of prostate cancer is a well-established risk factor.

However, the researchers found that a man's prostate cancer risk also appeared to be influenced by the number of sexual partners he had in his lifetime.

Men who reported never having a sexual partner were twice as likely to develop prostate cancer than those who reported having sexual partners.

However, the team found that men who had slept with more than 20 women in their lives had a 28% lower risk of developing all types of prostate cancer and a 19% lower risk of developing aggressive prostate cancer, compared with those who had slept with fewer than 20 women.

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