I got measured my temperature in my bum since I was little, suppositories as well. My pediatrician did the same as long as I went to him until age 16.
My first doctor plays I had with 7 with my best friend who was 9. It first felt strange but we were very excited so we continued to not only put in the plastic thermometer in the kit for kids, as well as pencil, little wood, sometimes real thermometer.
First time a doctor put in a finger was when I was 13.I also received a urodynamic study when something long for pressing measurements was plugged in, I got the ultrasound stick in several times which was really nasty while it was moving in me, and I got my first stiff rectoscope in which was quite painful like the urodynamics.
With 19 I had my first colonoscopy, what I already described in the story I have posted.