I'm straight, but I support any sexualities because to me, you love who you love and if it makes you happy, then so be it. I get really upset when people start openly hating on any sexualities except for straight people, which happens a lot in my tiny, narrow-minded town full of religious nuts

(not hating on religion here, just saying that living in a town full of Christians like this pretty much guarantees that if you don't live by the Bible, they shun you.)
My best friend claims to be bisexual, and I'm okay with that, but I'm not sure if she *really* is, because she never started talking about it until she started hanging out with other bisexual girls. Maybe they made her feel more open with it (if she is truly bisexual), or maybe she just thought it would be cool to like boys and girls (unfortunately, I think it's the latter).
Either way, she's my best friend, so whatever. I really don't care. However, I wouldn't hold her to it, considering we're both still teenagers and those dang hormones will make ya do anything

(although I'll say they've never made me feel attracted to women....just very, very, very attracted to men, LOL)
Sorry for the rant, I just wanted to put in my two cents. Plus, equality is always something I've felt very passionately about. Although I myself identify as straight, I enjoy discussing other sexualities in a place where I won't get screamed at for it. (You think I'm kidding? One time I said "gays are humans too, you don't need to be so cruel" to one of my classmates and 2 different people started literally yelling at me about how it was a sin. And the teacher didn't do anything. *sigh...*)
Again, sorry for the ranting XD