A mistress stamped on my balls several times, but the worst part, but actually the best part, because I am a masochist, she pushed her stilleto deep into each ball 5 times, I screamed in excruciating pain, my right ball was really sore after that session, you need to be careful what you ask for, unless you are a true masochist like I am, for me it was exquisite, my right ball aches at times now, but that is an amazing reminder of how sadistic she really was, it is the best experience of my life.