This is how I usually bust my balls. The underwear protects my scrotum and I usually keep a sock on the bat to cushion the blows to the scrotum. The cushion protects the scrotum enough so I can keep whacking my balls until they get so swollen that I have to stop or else I can feel that I risk getting a serious injury to the scrotum or testicles. The balls will get numb and it's a weird feeling. Maybe that's where the slang term "numbnuts came from. #Ballbusting #BDSM #SelfBallbusting