My mother took my rectal temperature until I was 12 or 13. She was always very nice and gentle and I must say I enjoyed those moments of intimacy with her.
As an adult, I have been lucky enough to share my rectal temperature fetish with most of my suscessive girlfriends and they took my temperature as I took theirs. There was never any kind of embarrassment with them.
I had one experience of an embarrassing rectal temperature taking. As I turned 18, I had my last high school annual medical exam. Then, after the genital exam, the school doctor, an attractive young lady, asked me, standing in front of her, to turn around and then, without notice, she parted my buttcheeks and inserted a thermometer in my rectum. She said with a gentle voice: ''Relax, I just take your temperature, it won't take long"'.
As the thermometer registered, with two other women present in the room, the doctor kept her hands on my buttocks. I felt humiliated to have my temperature taken like a baby, at 18, but soon, the feeling of the thermometer penetrating my rectum and the solf touch of tbe doctor's hands on my butt turned me on and I started to kind of enjoy the situation and to develop an erection. A very embarrassing but exciting experience.
52 years later, I still remember the schooldoctor and the red miniskirt she wore that day