Remember that this alphabet soup is concocted for political activism. Otherwise they are just identities. There is no objective reality to any of them. What does it mean, for instance, to be "gay." If I perform a thousand fellatios and bend over for the Dallas Cowboys am I still gay if I'd rather have sex with women but never do? A person like this could identify as gay or straight or bi. And there are plenty of people who have only straight sex and fantasize about gay sex. Don't get caught up in the idea that any of these identities are as taxonomically different as say, fishes, birds and mammals. You're a L or B or G or T if you say you are and no one can prove any different.
