I've been thinking that at some point I would like to try CBT when I actually have a domme, but I don't know what the most dangerous forms of CBT are and which ones are the safest. I need to know which forms of it I am absolutely not willing to do and the ones that I am willing to do, but it's a bit difficult to know when I have not experienced CBT. My main concern is damage to the balls. I honestly don't care about fertility at all, but anything that might result in me passing out, vomiting, or possibly dying is mainly what I am concerned about. I've seen places online to buy ball crushers and ball vises. They looked frightening to say the least and I could not understand how those things could possibly be safe, but there must be a safe way to use them. I'm just trying to decide which forms of CBT belong in my hard limits category and which ones I would be willing to try. Any information about this would be appreciated.