I don't think so. How can you know if you really desire something if you haven't tried it? You get a box of chocolates and they all look good, but some might be filled with chili, orange, and chopped up liver. So you think it might be good, but really once you try it, you don't like it.
Though there is the theory that everyone is bisexual, and that they don't act on it because of societal norms and whatnot.