Why exactly does living a promiscuous lifestyle lead to a higher risk of getting prostate cancer?

[Christian_Crusader]

http://www.harvardprostateknowledge.org/does-frequent-ejaculation-help-ward-off-prostate-cancer

An earlier study, however, found that men who had sex with 30 or more women were two to three times more likely to develop prostate cancer than men with only one partner.

 

Anyone have any ideas?

 

And while we're at it how strong is the evidence exactly that regular ejaculation of semen results is a lower risk of prostate cancer?

[StringJunky]

http://www.harvardprostateknowledge.org/does-frequent-ejaculation-help-ward-off-prostate-cancer

 

Anyone have any ideas?

 

And while we're at it how strong is the evidence exactly that regular ejaculation of semen results is a lower risk of prostate cancer?

I think the HPV may implicated in some prostate cancers and, like any sexually transmissible organism, the odds of infection increase with the number of sexual partners.

[Handy andy]

http://www.mayoclinic.org/diseases-conditions/prostate-cancer/expert-answers/prostate-cancer/FAQ-20057800

 

The evidence is marginal but my doctor confirmed to my wife that regular sex does protect against prostate cancer, we are taking no risks