Three...that's the magic number

I just did some research. On the American Cancer Society's website, they mention "sex with uncircumcised males" as a risk factor for cervical cancer. My guess from reading is that men who do not know they have HPV can spread it and perhaps the signs of the virus are hidden by the foreskin (or on its underside and not visible). HPV is apparent in ALL cases of cervical cancer, so that's clearly the link.