What are your experiences with testicle tapping? My wife spanked my balls for the first time while giving me an otherwise tender handjob and I have to say I loved the sinister flash in her eyes. Her staccato slapping was jolting and I loved the feeling of vulnerability. Now I wonder how far this can go? What are the variations? Should I be worried about permanent damage? Should I dare ask for her to go harder and faster? to grab? to scratch? to stretch? I'm new to this, help me out! Share your stories please...