My previous PCP for 3 years in NYC is gay, and I had a strong feeling from the very beginning that he was subtly flirting with me.
I never fancied him, and he has a very good reputation as a doctor.
For some reason during the yearly exam, his "let's check the prostate" had a special soft, different tone from all other questions/statements he made, and he was always so "intrusive" in the way that he checked it, that it gave me the hint to change him with another one, as it started to feel a bit uncomfortable, even if he never crossed the border.