Men with more than 20 male sexual partners twice as likely to develop prostate cancer

3,208 men 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.

Men were twice as likely to develop all types of prostate cancer, compared with men who had never had a sexual partner. Furthermore, men who had slept with more than 20 male partners had a 500% increased risk of developing a less aggressive prostate cancer, compared with those who had only slept with one man.

The researchers are unable to accurately identify the reasons behind these findings.

3 Replies

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  • Replication? Other similar studies?

  • This is a new study...it will be some time before it's replicated. There are studies that looked at Gay and Bisexual men versus Hetero disease progression, including mine which was part of the American Society of Clinical Oncology annual meeting last June. My and other studies show disease progress as slightly more pronounced for Hetero than GBM. Also, worth noting that Malecare is wholly or partly involved in approximately half of all Gay prostate cancer research, worldwide. We did not participate in this particular study.

  • Thank you for this more detailed context. I hope studies continue to clarify these questions.

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