I complied but never liked it. Starting fussing about it and rebelling around 8 or 9. One visit to drs, I had told my parents on the way over that I didn't want it taken in the butt. When the dr said he was going to check my temp, I said I wanted to do it in the mouth and my parents asked when I might start having it oral. I was laying on the table with underpants only , which were pulled down already to my thighs, my parents and younger brother and sister and a nurse were in the room.
The dr said that girls of 9 or 10 could started taking it orally and do it without problems but that with most boys tended to clamp down too hard on it in their mouth, or not be able to keep it under their tongue, and how dangerous it was if a boy broke it in his mouth, broken glass and mercury etc, he said that most boys cant do a good job of it until about 12 or 13 and that many of them had it taken rectally in his practice all the way through high school.
I tried to convince him I could do it but he insisted on rectal because I was always complaining of stomach aches and he thought it would be best to continue rectal temps for now. So I had to turn over and in front of my whole family ,naked butt exposed for the longest time while they chatted. This was hard for me because I was the oldest, the big brother. I watched the dr swirl it around in Vaseline and he spread apart my cheeks and pushed it in telling me to lay still and not move and that he was going to just put the thermometer 'back here in your butt just like you've had it done before'.
I'd protested in the only way I could by tightening up and he scolded me telling me to relax . He explained to my parents that kids tended to try and push it out of their butt by squeezing and pushing on it. Sure enough, I had managed to push it out and it fell out. After the dr reinserted it, he had the nurse came over and took over and held her fingers across my butt to hold the thermometer in, pulled it out to check it and pushed it back in and held it in again with her fingers across my butt cheeks for at least 5 mins. They were instructing my parents on how to do it but they never did it at home. I will never forget how embarrassed I was.