Normally, the doctor gives you plenty of time to put the gown on, and knocks on the door first to make absolutely sure you're covered up and are ready for him to enter the room.
However, one time a doctor walked into the exam room just as I was removing my panties. It happened to me only once and it was accidental.
At the hospital emergency room, I was handed a gown by the nurse and asked to completely undress. It took an extremely long time for me to change into the gown because my appendix was rupturing.
The doctor walked in (of course) as soon as I had my panties pulled half way down my thighs. And, because I'm a dumb ass -- I was bending over with my backside TOWARDS the door. I assumed the doctor would want to preserve my modesty and either turn around or leave the room for a few more minutes.
Instead, he walked towards me, helped me stand up and put the gown on for me. I was so mortified that he saw me bending over with my panties half pulled down that I just let him dress me like I was a helpless baby. He even tied the gown and lifted me up on the table. It was humiliating at the time, but now when I think about how he walked in the room and the first thing he saw was my naked bottom.... then he "dressed" me....It's extremely arousing 😃
p.s. Lady Teddy....Your posts are always totally erotic and hot. I LOVE IT!