Your opinion on biuality?

I am a male, and I have heard of various conceptions about us. Many say that we are undecided. Or that we're promiscuous and require two partners at the same time. Some say that we don't actually exist. I personally object to these statements, and I doubt I happen to be one exception. We face flack from both straights and gays (I'm generalizing here). Why? What do you think about biuality?