The inside info on that old joke has to do with a firend that was going in for a vasectomy.
I convinced him he had to shave as clean as a whistle down there before going in for the procedure.
I told him that if he didn't do it himself that a gay male nurse would have to do it for him as prep for the procedure.
Of course that wasn't true at all.
I haven't had a vasectomy myself and I actually know nothing about the prep or procedure.
I just figured it would be funny as hell if he showed up slick as a whistle at the clinic.
As it turns out, I was right, it was funny as hell!!