I once caught a mentally challenged youth "playing" with himself after a P. E. class in high school. I quickly turned around and darted for the locker room door. I saw him later that day and he put his hand on my shoulder. In retrospect, I should have given a box of Kleenex just to show that I supported his ways as long as he never asked me (or anyone) for a piggyback ride.
Probably should have washed your shoulder off. In retrospect.