While driving en-route to a military assignment some twenty plus years ago I came down with a fever which I later was told, was due to a strep throat infection. I stopped at a Hospital, and went to the ER. There I was seen by a nurse who took my information. There was another female, and I'm guessing she was perhaps 18 or 19, as her uniform had a tag on it reading "TRAINEE". Well, I requested that I have my temperature taken rectally, and the nurse said OK, and expecting that the nurse would do it, even though this girl was there, and I thought she'd get a "show" as I had my temperature taken, though I didn't care if she saw it.
As it turned out the nurse told the girl that she would get my pants and underpants down, but that the actual temperature taking would be done by her (the girl). As I was face down on the table, the nurse quickly got my slacks and briefs down behind my knees.
The teen, I'll call her, grabbed a thermometer out of a drawer the nurse pointed out to her, got a packet of lubricant, opened it, shook the thermometer down, read it and dipped its bulb in the foil packet, lubricating it. She came behind me, spread my buttocks and slowly inserted the glass thermometer. It was obvious, this girl had taken rectal readings before, though I suspect on pediatric patients in the ER.After it was in a minute or so she started to twist it! I got so turned on, and I was afraid that after she removed the thermometer she'd see my erection. Well, they both saw it, and the nurse told me that sometimes happend when guys would get their rectal temperatures taken.
The thought to this day of this really cute 18 or 19 y/o trainee taking my rectal temperature still excites me.