I was reading around the forums today and had to make note of something. There is a Top wandering around somewhere here on Eden who says S/He (I don't remember their gender, sorry) only carries metal cuffs to get a rise out of their bottom... They don't recommend using them. Could someone please tell me why? My boyfriend and I have metal cuffs and shackles we've been dying to try as soon as we have a frame on our bed, but if it's unsafe I'd rather find something else... Help!!!