To the point: I don't believe the term "bisexual" is a valid one, at least not in the way most people use it, which is to say that they enjoy sex with men and women only, full stop. The reason that this is inaccurate is that it assumes there are only two genders, when in fact there are not two, not three, not any number that can be pinpointed. So, if you're going to say you're bisexual, the appropriate usage of the word would be accompanied with which two genders you're attracted to, without an assumption that it's always going to be the traditional binary. Perhaps you're only ever attracted to men and transmen. Or women and transwomen. Or androgynous individuals and gender fluid individuals. Or any permutation of any of these along with the many not listed, you get the idea.
Personally, I find labels so stifling, static, boring. I don't mind saying I'm pansexual for those who won't shut up until you give them an answer as to who you're interested in fucking (as if it's any of their business), but the fact is I'm not willing to fuck just any gender. I'm only willing to fuck an individual of any gender if they meet up to a set of very high standards, regardless of their gender.
Oh, and don't even get me started on forced bi. The fact that someone has a bio dick really has very little to do with that individual's gender. In a "nutshell," in the context of the above, forced bi doesn't have any literal meaning to it at all either. So suck a dick.