Same here, very touchy topic and one that gave me sleepless night in this past year.
Especially because I have these split desires. For one I long for someone to take care of me, to guide me - but not crully or just because of the pain, and not to break me (again...) but to built me up through what we have together.
But then there is also that vanilla thing, that I long for...
Sometimes I just tell myself "Look, Vanilla is your healthy side... the other desires are the sick one..." Like I said, sleepless nights.
At the moment I am at that point where I think I should mix it - like to find someone who also likes both... Guh that is all so confusing!
Another things is that I am kinda repelled from the idea that someone enjoys hurting teh one he loves (or anybody at all for that matter).
I am rambling again...
But I don't think that it must be a result from abuse. Like that crap homosexuality (especially for women) would be.