I don't think anyone is 100% anything. We were created bisexual. If we weren't we would not be able to have same sex friendships. Ever meet a guy and just like him instantly and want to be friends with him or meet a guy and NOT like him at all? It's not about sex but about our general make up I think. We all have it in us to be attracted to someone of the same sex. It takes more with some guys to feel this attraction than with others.