Not exactly, but a couple related stories:
About six years ago, I started going to a new doctor and they told me to take everything off but leave on my underwear, and then wear a gown. I ignored the instruction and stripped to my briefs and left the gown bunched up next to me. My briefs stayed on but were lowered for the genital and rectal exam. FYI … the next year I went back to the same doctor and was told to strip completely, including underwear, and to wear a gown. That time I did as instructed.
In the early 2000s, when I was in my young 30s and very fit, I had three yearly physicals from a doc in his mid-60s who pretty clearly was in to me. He practiced in a small clinic with only five doctors, including father and son. I made the appointment with his son, who was in his first or second year of medical practice at the time and very cute. It would've been the first time I saw a doctor who was younger than me. I made it clear that there was a history of prostate cancer in my family (true), and that was the reason for my visit. In the days leading up to it, I fantasized about what it would be like to have the young doctor slide his finger inside me for my first DRE.
When I arrived for my first physical at that clinic, I was disappointed when I was told at the front desk I'd be seeing the older doctor. There was no explanation given. I did see the older doctor appear by the reception desk and look at me in the waiting area. Back in the exam room, the medical assistant told me to strip off everything and to put on a gown. It was my first time being naked under a gown and really hot. The older doc gave me a thorough DRE (with me on my side). His finger was very large. It was awful and wonderful at the same time. I jerked off in the restroom on the ground floor of the medical-office building afterward – I couldn't wait to get home.
So … the next year I made an appointment with the same doc. This time, the medical assistant got me in the room and just told me the doctor would be in. I sat there fully dressed, wondering how this was going to play out. Well, he came in the room and said a couple things, and then just told me to get undressed. He watched me as I did. No gown was offered. I stripped as he watched me, down to my black boxer-briefs. I recall thinking to myself whether I should ask if he wanted me to take those off too, or whether I should just take them off. I chickened out and just took a seat in my briefs. To this day I fantasize about just stripping all the way, since he was not specific. The briefs were at my knees for the DRE.
My last physical with him was the next year. Like the first time, I was directed to strip all the way and put on a gown. This was the hottest of all the physicals. The doctor removed the gown from my chest very early in the exam and just kept there. It covered my lap when I laid back. When it came time to check my genitals, the doctor just pushed the gown up on my chest, farther than it needed to go. I clutched the gown in my hands as he had me role over onto my side for the DRE.
After he inserted and removed his finger from me, he told me I could get sit up. I did and didn't make any attempt to conceal myself. He told me to get dressed but was just staying in the room. My briefs weren't that far away, but I did leave the gown on the exam table and was completely naked for a bit in front of him. I can't recall whether he was watching me, but I imagine he was.
Sadly, he retired after that. 😢