There have only been a few times that I have hit them and they hurt, I haven't hit them much. I have had a 30lb French Bulldog step on them. All of those times it hurt a lot, much, much more then getting hit in the testis. Those useless bits have always been small and were inside my body most of the time. They have never hurt getting hit any more than getting hit anywhere else. Maybe because they were inside of my body or because of being small, or both. I don't remember the last time I have seen them to be honest, maybe in my late teens 30 years ago.