When I was 14 (some 20+ years ago now) I was into experimenting with all sorts of crazy masturbation. I read a part from the Stephen King book “The Dead Zone” where clothes pins had been attached to a penis to simulate what an STD felt like. I just had to try this… did it many times. It got to the point where it was an exercise in how many clothes pins I could attach to my erect penis and how long I could stand the pain. In the end it grew tiresome so I just quit doing it one day. I have no desire to try that again.