I think alot of the online is as a result of things like 50 shades. There are people who want to experience it and be part of it but aren't really committed. Online they can hide behind the facade. As someone who is more into the physicals of BDSM and is both a masochist and a submissive, I fail to see what it brings that normal cyber sex does not, other then adding some elements of a fetish into it. Having said that I do enjoy a good BDSM novel, but partially because it gives me ideas of things me and my Sir can try!