that question is something that puzzles me for a very long time. I know that your sexual preference is set very early, but I always thought that was only about hetero/gay/bisexual and everything else would come later. But I am not sure about bdsm.
- When I was still in Kindergarden (age 4 or 5) I remember one certain "dream". I enjoyed thinking about that image so much, that this memory is still in my head. You know there are handles for your hands, above the windows in your car. I imagined being naked and bound with my feet to one of those. Yeah, think about that. It is a very unrealistic image, but I was young and I guess I used the things that were available in my fantasy. That is one of the reasons why I am absolutely sure that is not a supressed memory. It DID NOT happen.

- When I was 12 I had some fantasies that often included me being bound. Not hurt, it was just about me being helpless, while someone fondles me. Oh yes, and one girl from my class I imagined sitting on my face. Funny, because I had absolutely no clue what that meant by that time. But the imagine was in my head.
Okay, you can argue that with 12 puberty had already begun and I developed my preferences (although I wonder why bondage in that age). But the early memory puzzles me. I still remember feeling helpless and I liked that thought.
Myself: No history of sexual abuse, but being bullied in early ages. But not as early as kindergarden.