If you can choose between being a heterosexual and a homosexual I will call you a bisexual.
And I'm just saying, there's probably a lot of bisexuals out there that would be pretty insistent they were one or the other for whatever reason.
You see, the thing is, "preference"? Preference is seldom absolute. It's conditional. You change the circumstances, you change the preference. And most people have, at least technically, quite a bit of control over their circumstances - more than they think they do, anyways. And we're essentially talking about at least two, and probably more, degrees of not-directly-interacting desires and trying to tease "preferences" out of that. Is it really even
useful to define someone by their preferences? I know of extremely "heterosexual" guys that have a LOT more homosexual sex than those who identify as bisexual guys. I know homosexuals, personally, that sleep with way more women than I do and are, in fact, probably more attracted to women in general than I am to anyone, ever, at all.
But their
preference is still pretty crystal clear. Giving the option of two very similar people, but one if of their preferred gender, there would be no hesitation.
So I guess you could say that's not a choice. But if I suddenly put them in a room with only members of their preferred sex that they find incredibly unattractive, and members of their least desired sex that are incredibly attractive, they would suddenly "prefer" the opposite gender from that which they would normally. Are these folks truly bisexual? Is this a choice? Maybe it's not. Maybe they aren't bisexual.
Maybe it's just that sexuality isn't the most important or relevant component of the choice about who to have sex with.