Not the same, but I've come across someone who was initially perfectly sane, funny and witty on messenger. Rock climber, steady job and all. After two months chatting (no "funny" chatting btw, all very classy! lol), he confessed that he was into hard bondage / dressing up in leathers and stuff and liked being spanked. Out of the blue.
I thought it was a joke....It wasn't! He got blocked pretty swiftly after that! lol
Well, Dot...I would imagine "normal" bondage to be soft tying up, with tights or scarves, as part of a "normal" session...
Whereas "hard" bondage would be stuff like being hung up upside-down from the ceiling, wearing a gimp mask? lol