You guys don't need to sound all surprised OP might not fully "get" bisexuals or talk down to him like some seem to be doing...
I'm bi myself, and just to get into a little more detail, there's this whoooole grey area between gay and straight:
-some like both sexes eaqually
-some "lean" more towards one sex or the other
-some take different traditional roles in a relationship depending on the gender they're with. I had a friend who was the traditional "boyfriend" when he was with women and the traditional "girlfriend" with men.
-some have their preferences shift back and forth between sexes, which is what happens to me, and it can be rather frustrating, but I've learned to just go with the flow.
It doesn't surprise me people are barely aware of bisexuality, which includes western European nations as well. People in western nations have just relatively recently accepted homosexuals (some more than others) so I'm not upset or angry when people have questions or don't understand bisexuality. A lot believe a lot of it's myths: http://www.alternet.org/sex/149710/9_stupid_myths_about_bisexuals_that_will_make_you_laugh/
I've found that homosexuals are just as bigoted and judgmental towards things they don't understand as much as heterosexuals; I've had a gay man that was initially interested in me tell me once he found out I was bisexual, "I don't buy that crap, maybe with women, but not with men", telling me that I basicly didn't exist.
It's weird since a lot of people on both sides have trouble accepting it. To a lot of straight people "Bi" is just another word for "Gay" and to a lot of homosexuals I'm not "Gay Enough" to be fully accepted by them. Which is ironic because I had to struggle with liking guys as well in a religious school and they said bisexuality didn't exist either, only gay or straight, so I was horrified at 13 that I was "turning gay" despite liking girls too and in there it ment I was becoming a "bad person". I brought up that point with him and he said "Well I dunno, I just never met one"
Luckily I've found a bisexual girlfriend who can see both sides of a relationship as much as I can, like I know how much of an asshole guys can be, and she knows how bitchy and manipulative women can be. It's a rare experience to have a boyfriend/girlfriend relationship where both actually "get/understand" each other.