Nothing wrong with BDSM, as long as it doesn't involve any of the more dangerous stuff. Just for purposes of safety, I'd say it wouldn't be a good idea to do anything where there is a high potential for serious physical harm. Other than that, I see nothing wrong with it, and I think more people are into that than like to admit. Normally, I'm not into it, but there was once when I was extremely high that for some reason I thought it would be really exciting to have a girl burn me with a cigarette. Not that it'd be a good idea obviously, but for some reason I was into it at the time. So, yeah S and M is pretty common even amongst people who aren't really into the whole scene. In fact, I'd say most couples probably dabble in it in one form or another at some point.