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

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 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.

7 Replies

  • Now you tell me

  • I am certainly in the 19%, worked for me!

  • Interesting.

  • Damn!

    I married the 19th one and have been faithful ever since. Just one more might have saved me :)


  • Do you think they all told the truth? Even in an anonymous questionnaire? I am a little t number - well tell the truth quite a bit as my Mum told me scare stories of dreadful diseases! Worked for me when I was young but made up for it a bit later on, just not enough!😄

  • Yes but - length of marriage has consistently been found to be a risk factor for PCa. e.g. in the study below.

    "men married for 50 or more years had a relative risk of 2.7"

    I'm coming up to 49 years of marriage.

    I have a theory.

    Men with over 20 sexual partners don't get a lot of sex. Whereas married men get as much as they want. >20 partners is a sign of failing to establish a relationship - a failure to have a lot of sex.

    OK, joking aside, having many partners probably means having a lot of protected sex. My wife & I had two kids at a young age, & I had a vasectomy just before age 30.

    The disturbing thing is that a natural monogamous relationsip might be dangerous. Neither of us ever had infections, but whatever bacteria she had was shared with me, & possibly my prostate.



    There were 1,556 men who had been married only once and who were still married at interview (Table IV). Among this subgroup of men, there was a trend of increasing risk of prostate cancer with increasing length of marriage: a 2% increase in age-adjusted risk (95% CI 0–4%) per year of marriage. A similar trend was observed when the analysis was restricted to cases with stage 2 or more advanced disease, but the trend was not apparent when the analysis was confined to the 137 men with stage 1 prostate cancer who were married once and still married at interview. These results were not appreciably altered after adjustment for a history of prostate cancer in a first degree relative, religion, social class or educational level attained at school. When fitted as a categorical variable in the regression model, men married for 50 or more years had a relative risk of 2.7 (95% CI, 1.0–7.3), compared to the reference group of men married less than 20 years.

  • wow..I hope that is true...since joining the free dating site POF...I have had more than 20 women in the last 60 days

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