I'll be the first hetero-female to chime in one this one.
I'm honestly not sure. To the best of my knowledge, I do not know any bi- men in RL. I may still suffer from a little bit of stereotyping, but if I was to form a relationship with a bi-man then I think that these would disappear rather quickly.
I don't think I would have a problem if he was open and honest about it and didn't hide it.
As for statistically, well, like I mentioned I don't actually know any bi-men off the top of my head so unless my friends circle grows in that direction, I'd be more likely to date hetero.
A last minute add on... If I were to date a bi-man, then he would have to be respectful of the fact that my hubby is completely hetero (not to the point of phobic though).
Life is about the journey and not the destination,
so what better way to know life
than to wander all the roads and paths set before you.