Doctors, lawyers, dentists, politicians, elementary principles....they're all in positions of Power. Some abuse their positions of Power to fill some personal void or fulfill some perversion. I've been to several endochrinologists for thyroid issues and NONE of those questions were ever directed to me.
This guy is a pervert who is abusing his position of Power. If it were me, not only would I never return to his office, but I'd report him to the American Medical Association.
Doctors (in particular) are NOT gods and it's imperative that members of the general population realize this fact.