Nope, the doctor does not need to know unless you're 24/7 or on hormones. I always go to mine in guy mode and have not said a word. However his brother is a physical therapist, I met him once and he is definitely gay. So I should be good to go once (if) it's necessary to tell him. The one thing that concerns me is that my doctor has 3 or 4 girls working in his office that have access to my file and that does bother me.