I would have to agree with Vader. I also made this account almost strictly for disproving the ignorance expressed above, although now that I'm here, it seems pretty cool.
For one thing, BDSM should be thought of as an ORIENTATION. Participants could be of any gender, but the idea is the same: you can't deny it, you can't hide it, it's not a choice, and in my opinion you are born that way. If you can have sexual fantasies before you really know what sex is, this is what I fantasized about. No, I was not abused. No, I am not psychotic, although depression is a bitch. No, I can't think of any weird Freudian reason why I would feel this way, aside from simply: it turns me on. I can't get off otherwise, if you will. Can a gay man enjoy sex with a woman? Likewise, a devotee of BDSM can't get what they need out of sex unless they acknowledge these wishes.
If I must psychoanalyze myself as a submissive, I would say that it is because I am too shy to relinquish control "naturally," so this makes it a lot easier. There's not as much pressure. But I believe that it is quite possible that these traits are unrelated, and that I am into BDSM because I am into BDSM. I fully consider it a sexual orientation, which makes me sympathetic to the cause of Gay Rights and other sexual minorities that are considered "weird" or "freaky" or "wrong." It's not wrong. Taste in sex is like taste in ice cream: you can't change what you like, so you might as well acknowledge your desires. It's just that us BDSMers happen to like fudge-ripple instead of vanilla.