@Wrestler67
In the early 1970s, in the western USA, a jockstrap was required in for our gym class. Once a week, on a random day, the gym teacher would have us line up and when he walked by, we had to pull down one of the two "straps" below the pant leg of the gym shorts so he could clearly see the strap. If we were wearing just briefs, we had points taken off of our grade for the day.
One day, I remember a kid pulled just the edge of his briefs down to the edge of the gym shorts so half an inch (1.2 cm) was showing. He figured the teacher would be in a hurry and seeing enough white material, he would just move on thinking it was a jock strap. Mr. Shanderah had seen that trick before and the kid got double points taken off and had to do push ups in front of the class.
If it had been five years earlier, the kid would have gotten several smacks on the bum with the "whooper." The whooper was an old rubber sole from a very large man's tennis shoe. Mr. Shanderah had removed the upper cloth and laces. He could hook his fingers in the large rubber "toe" covering and swing the whooper so the heel smacked hard on the intended target. He kept the whooper hanging on the wall in his office for old time's sake, but last used it in the late 1960s -- the good old days.
One day, I asked Mr. Shanderah for a demonstration of a couple of whooper smacks on my bum. He hummed and hawed and hesitated as I continued asking during class time. After my many requests, he acquiesced and took me into his office. He had me bend over to touch my toes and he gave me a couple of sturdy whacks that really stung. I don't think he swung as hard as he did in the 1960s for real discipline because he didn't want to face a lawsuit for teacher abuse. And he did not have me pull my shorts and jockstrap down for the same reason. I'm sure he could tell by my playfulness that I had no interest in suing him. I just was curious to know what it would feel like.