You guys are totally confusing me. But I do believe the topic somehow bent itself into the nature of states of sexuality. Or any other combination of big words that make me sound like a scientist.
Here's what I think: All creatures are heterosexual, if such a requirement exists (some species are lucky enough that they can do anything with anyone and still have offspring). However, sexual PREFERENCE is a psychological thing. Anyone can turn from anything to anything else given the correct circumstances. That's the crazyness of the mind that I've come to learn pretty recently. The more you're exposed to something, the more you accept it, even if you don't want to accept it. It's like when you hear that stupid goddamn pop song on the radio over and over and it makes you want to poke your eardrums out, but later the same day you find yourself humming it. In a similar way, it is actually possible to suddenly find yourself accepting a preference or fetish or whatever, that you thought you hated by nature. Turns out it's not nature's call, it's psychology. I do believe that might be able to stretch as far as to the very basics of sexuality; whether you're into guys or gals. And, of course, if something happens at a very early age, it's more probable that it'll stick. It's pretty rare for someone to spontaneously flip directions mid-life. But I do believe it can happen, and maybe even by conscious choice, although it's not something I'd like to research further...
Anyway, discrimination? Hating gays? I touched upon that. If you let yourself, you become more tolerant of the concept the more you expose yourself to it. Many people are scared of things like that, though, and don't want to accept it because they think they hate it by nature. I've reacted like that to weird fetishes some of my online friends have been stupid enough to introduce me to. I don't mind them now. Part of me wishes I could go back to hating it, because it's THAT weird, but it's too late now. I accept that stuff. And the more stuff I find myself accepting, the less freaked out I am by any eventual other stuff that I haven't yet been exposed to. I guess that's how crazy fetishes grow... The more you're into them, the easier it is to accept even weirder stuff...
Anyway. I'd consider myself openly bisexual (feel free to disagree about the "open" part though), and I know I haven't always been. It's cute to think that people are born completely neutral, able to go any way right from the start, but I don't think that happens. It is, however, very easy to start to see ounces of truth in what other people say and think. Then, some time later, you suddenly find you've gradually come to accept the sexiness of people in general, even if they're the same gender as you. That's pretty much how it happened to me. I can't remember the first time I accepted what was going on, but I wasn't THAT young. It's quite possible it started much sooner than I can even remember, though... I dunno.
Anyway, living creatures are born with the correct settings to reproduce. Occationally, some animal will make some weird choice that doesn't help at all, but then it's probably just for the fun of it or.. whatever... god, I'm finding it harder to form coherent sentences the more I type... Time for sleep...
WARNING! While I was typing a new reply has been posted! ... Eh, I'll read that tomorrow.
[edit] Oh holy crap, text...! How do I type that much and not remember what I typed afterward?! ... Sleep time! [/edit]