Originally Posted by Xurtio

Probably because you've lived a privileged cisgendered, heteroseuxal life, so the rest of society has been very accommodating to you and you haven't had to think in a way that challenges your preconceived beliefs. I would probably be in the same boat if my wife wasn't bisexual (I WAS in the same boat growing up in high school in the red state of Alaska). Thanks to my wife, I have been exposed quite a bit to the LGBT community.

In the end, there is no binary straight-gay. There's a scale from straight to gay depending on behaviors and attitudes towards particular stimuli. They use the Kinsey Scale in relevant sociological research:

0 Exclusively heterosexual
1 Predominantly heterosexual, only incidentally homosexual
2 Predominantly heterosexual, but more than incidentally homosexual
3 Equally heterosexual and homosexual
4 Predominantly homosexual, but more than incidentally heterosexual
5 Predominantly homosexual, only incidentally heterosexual
6 Exclusively homosexual
X No socio-sexual contacts or reactions

So if you just blew a tranny once but are generally attracted to women, you'd be a 1.