Such subtle irony that you use the phrase "supposed to be," as if prevailing beliefs should have anything to do with how we identify. And, yet, there are many who wouldn't hesitate to tell us who we are (or aren't) and how we are expected to feel and behave. Common presumptions about bisexuals are almost always inaccurate, by straights and gays alike. For the most part, it's one of two postures: we are either distrusted or erased.