I'm an uncut Belgian guy.
Here in Belgium we have school examinations every 2 years.
At every examination, you had to strip to your briefs (white ones in my time.
Then you enter the nurse's office in groups of 5. She weighs, measures etc.
Then, one by one, you have to enter the doc's office. He examines you and at the end of the examination, you have to stand in front of the seated doctor and he pulls your briefs to you knees. He then examines your testicles and pulls back your foreskin, no warning.
In my experience, I was never warned he was going to do that.
When I went for my army medical at 22, I had to enter the doc's office completely naked. And ... again at the end of the examination, the same things happens, no warning at all.
After a couple of times, we knew what was going to happen, so we weren't surprised at all when the doctor pulled back our foreskins !