Never have I done this. A guy I know of:
In a bar in Rochester NY known for ahhhh open mined lady's. would order his drink. And at the bar make a hangman noose with a long string. Go to the men's room and all or part of his manly hood in the noose. Came back out with the string coming out of the top of his fly. The lady's would take turns walking him around the bar for all to see. I do not know how much he paid for this.
I away hoped that once the noose was on. He had a way to stop it from getting the noose smaller. But no girl ever pull the leash to hard or fast.
Not something I would do. But if, I can think of many knots that would work without as much risk. He even counted the loops to make sure it was 13.
not my idea of a collar for a ....... !!