A male gynecologist. Sometimes referred to as a Man-OB-GYN or dudestetrician.
Meg: It's time for my yearly pap smear.
Sara: That's good. What do you think she'll give you for your yeast infection?
Meg: Oh, I don't see a gynecologist, I see a GUYnecologist. I guess at some point during medical school he decided he wanted to have his face in cooch all day.