I was never sexually abused, though I do have several family members and friends who were (and have talked in depth about it with me) and I don't think it really has a bearing on whether one is submissive or not, but more that it effects how you feel about your tendencies. But each person's experience is going to be unique to them, for some it may shape how they act/react, but for others it won't have any effect at all on their behavior/demeanor.

I do think a lot of us are simply born the way we are, but I also think our environment shapes so much of how we act and behave, regardless of what our initial nature might be.