Observing painful erotic medical proceedure

Has anyone ever watched a medical procedure on their wife, or any woman, that was very painful, but also very erotic to watch? My wife had an endometrial biopsy that was excruciating for her. but seeing her in that much pain while a strange man had her legs spread was beyond hot!

My husband is a mild sadist. He’s held my hand through that same procedure and I know it turned him on as well. It was tempered with concern about possible findings (all was negative) but I know he enjoyed it. I didn’t lol, but I know what he likes and I indulge him

I was with my wife's first IUD placement while holding her hand though the procedure. Wile the gyn inserted the sound to measure her depth she cringed alot while squeezing my hand. I asked her if she still wanted to continue the procedure and she said yes, but give me first time to breathe. Then came the second cringe.