Research showed that Lotharios with a lot of notches on their bedposts are significantly less likely to develop the disease.
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.
However, 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 3,208 men answered questions about their lifestyle and sex lives.
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 with prostate cancer as those who were sexually experienced.
Compared with those who had only partner, men who had slept with more than 20 women were 28% less at risk of prostate cancer of all varieties.
They were also 19% less likely to develop an aggressive type of cancer.
According to one theory, large numbers of ejaculations may reduce the concentration of cancer-causing substances in prostatic fluid, a constituent of semen.
They may also lead to fewer crystal-like structures in the prostate that have been associated with prostate cancer.
While having one male partner did not affect cancer risk, having more than 20 doubled the chances of a diagnosis.
It increased the risk of a less aggressive cancer type five-fold.
“It could come from greater exposure to STIs, or it could be that anal intercourse produces a physical trauma to the prostate,” said Prof Parent, who admitted the explanations were “highly speculative”.
The research is published in the Journal Cancer Epidemiology.
On the question of whether promiscuity might now be recommended in health advice to men, she said: “We’re not there yet.”
Men taking part in the study were aged between 40 and 79.
Most were of European descent, and born in Canada. The authors wrote in their paper: “Although reasonable, [the explanations given] remain speculative as our study did not collect information on these practices.
“Other measures related to sexual activity that could be addressed in future investigations include condom use, masturbation practices, and type of intercourse that occurred with each partner.”
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