Ah now I understand your point. I think you are putting too much emphasis on the bisexual. To me bisexual is anyone that CAN have sex with both genders. It doesnt mean identifies as an interest in both sexes. Going back to my prison analogy. I would imagine a straight man in prison that has sex with another man while in prison will still identify as straight. However, to me he is bisexual because he can and has had sex with a member of the same sex even if he never does so again. I can see the confusion on the word bisexual but I really have no other word that describes what I am talking about. If you are pure gay or straight most wouldnt be able to cross the line no matter what in my opinion.
And again thats it, opinion. I think yours has validity and its one of those things we will not know because one thing is for sure: Blind poll or not, people are shown to give the answers they want or expect to be the right answer under the circumstance versus giving an honest answer.