Pelvic inflammatory disease (PID) doesn't affect men because it's an infection of the fallopian tubes and uterus. It develops when bacteria move from the vagina up into the upper reproductive organs. Many times, these bacteria are sexually transmitted, and STDs like gonorrhea and chlamydia may lead to PID. Obviously, it's possible for men to have those STDs, and they can spread the responsible bacteria to a woman. However, it's not possible for those STDs to develop into PID in men like they can in women.