Avery I'll take a stab at that. If the belt is intended to prevent sexual pleasure it's serious use, if it's intended to enhance sexual pleasure it's a toy.
Something I'd like to add. My first belt was one I borrowed from my mother, who used it as a toy while fooling around with my Dad. I then used it as a serious device to protect me after I was assaulted. So the same belt served two purposes, one recreational and one serious.