I'm a true blond. I honestly don't know *what* I am, as I am a virgin and am not too sexually experienced, and I have since determined I am not going to know if I am a top, bottom, or vers until I actually try out each a few times.
That said, the idea of having someones dick up my ass is not appealing in my minds eye at all. Largely because I have quite a low pain tollerance and I garner no enjoyment from pain at all. It's because of this I feel that I would be more of a top. It's also that once I am comfortable with someone, I very much like to be in charge a lot of the time and have more fun calling the shots.
Really though, I just don't know.