Bisexuality exists. It's a fact. To deny that is idiotic, and disrespectful to the life experiences of thousands of people.
What's ALSO a fact, however, is that homophobic heteronormative culture has put an incredible pile of negative bullshit on top of the word "gay". What's worse, WE ourselves add to that with scene-hate, slut-shaming and femmephobia. Which leads MANY people who are still struggling to come to terms with their sexuality, to falsely identify as "bi", in order to avoid being associated with the supposed negative stereotypes of being actually GAY. It is harmful to THEM, and it is harmful to truly bisexual people.
My position is this: if we believe in the Kinsey scale (and I have never had a reason not to), then of the 0-6 spectrum, 1-5 have some attraction to both genders. But if we call all of these people "bisexual", that will be about as accurate and informative, as if we called them simply "sexual". It is not accurate, it tells us nothing. A 1 who would never really do anything with a guy, but isn't repulsed by the idea either, is not "bi", he is straight. And a 4 who is keeping pretenses of being straight, while fucking dudes behind his girlfriend's back, is not "bi" either. A bisexual person doesn't struggle with his urges. He likes PEOPLE. Sometimes those people are male, sometimes female (and if he's pan-, then they can be trans too). But a bisexual person NEVER EVER has the problem that Pickwick describes - that of needing dick while with a girl, or needing pussy while with a guy.
And if you can't, with a 100% certainty, state that the above applies to you, if you really pretty much always want the dick, even when you're banging chicks, I am sorry, but you are misusing a term, and harming the bi community. They already have to deal with enough shit from both straight and gay people. They don't need self-deluding homos making it worse for them. Otherwise we have idiocy like cgymike's.
And I am sorry, but I truly don't care if people are getting offended by this position. But it's laughable to accuse me of intolerance, when the real intolerance is the inability to embrace being gay, and trying to pretend you're something you are not, just because you can get it up to a chick.