Although, some people have different "levels" at which they want their SM play, or their BDSM lives, to attain.
I know a couple, although I don't necessarily agree with them, that do not involve their m/s or SM play in the bedroom at all. Period. I, myself, do not subscribe to this theory. I prefer to inflict some pain, puch limits as I see fit and have some great sex afterwards.
For some people, it's all about the power. The feeling of yippee-ness they get by "forcing" someone to do something "against their will." This doesn't work so well for me. I can do it, but I usually wind up feeling guilty fot if afterwards, because my partner is left unsatisfied.
Others are complete limit-pushers. They want to see how far things can be taken before the submissive begs for the scene to stop. This is the type of person I would like to become. Before a lengthy and unwilling seperation from my submissive, I was working toward that goal constantly. Unfortunately, we have suffered some setbacks since then and are looking to get back on track.
Lastly, there are the "true" sadists and masochists. The people that really, really enjoy pain and can give it and take it in huge degrees. Admirable, yes, but probably not for me and my partner. There seems to be a great gravitation to this particular area of SM. A submissive of mine that I talk to frequently online is a pain slut. The more she is whipped, the better she likes it. Hey, if it works for her, who am I to complain, right?
I like to think I push some limits, am satisfying to my partner, but also not lacking in discipline. If I'm not, then this is the person I want to become.