Hi, had a quick question, me and my husband are into kinky BDSN and CBT mainly ballbusting. And I was just wondering how much can the testicles take before it causes serious permanent damage. Mainly we like squeezing, slapping, punching, and hard ball grabs. Please let me know, want to know because we re just staring it and don t want to go to far and really hurt him. Just looking for best answer or what your opinion is. Thank you.