Micheal wrote:
The more guys deny it, the more likelihood they are afraid of anyone finding out they are, to some degree.
This argument is kind of bullshit.  It's a catch-22.  Moreover, having a mild curiosity about the opposite sex is pretty common and does not make you "bisexual" unless you man in the sense Taly does where everyone's at least a little bisexual, which is true but is sort of a way of talking the issue out of existence.
The fact that a person has a minor attraction to the same sex doesn't really make them bisexual just as a minor attraction to the opposite sex doesn't.  Even acting or experimenting doesn't necessarily make them that way.  A bisexual person is a person who feels a nontrivial possibility of a serious relationship with either sex.  It doesn't have to be equal attraction both ways, but it also does not mean "any attraction both ways no matter how minor."