A prior pelvic infection in college may have very well closed off the fallopian tubes and are now not allowing her to conceive naturally. (kidsinthehouse.com)
Sex was horribly painful for the 7 months I had it and unfortunately, I was one of the rare folks who got a severe pelvic infection from it and, consequently, had my fertility ruined. (whole9life.com)
It can cause pelvic infections, ectopic pregnancy, and sterility if untreated. (sciencemag.org)