Never erections -
My Dr. experience was with my Gay Dr. (we had attended various Radical Fairy gatherings - one held at his farm - but we never crossed the line sexually) During a required work insurance physical, he did need to check my prostate -- as I bent over the table and his finger went in, we joked that he had always wanted to get in there and he had found a way!!!! I got a semi and dripped lots of precum -- normal for me when prostate is involved.
Except for the banter, no lines were crossed -- That wasn't really crossing a line either as we knew each other and had hung out naked at the gatherings ---