Me on the left.
Are people born gay? serious question
I never felt sexual attraction. I had a hormonal problem that had to be treated with anabolic steroids, and when I started them, I was immediately exclusively homosexual. Not sure if I was always meant to be gay or the roids turned me gay.
Probably the same way people garner fetishes. Exposure
I was. Over time though I've become more bi. Only for 2D though.
Speaking from experience, I was never completely averse to the thought of having sex with fellow males, just slightly ashamed of it because of social stigma. I don't care anymore, though.
So yes, I was probably born bisexual, or with a predisposition to become attracted to men.
Everyone is bisexual.
Not really. Bisexuality is made-up in the same way the "third gender" is made-up. If you're dating a guy, it's gay. If you're dating a girl, it's straight. No such thing as as bisexual relationship.
Gay and straight are made up terms too.
But they actually exist. A sexual/romantic relationship between a male and a female can exist, and such between a male and male or female and female can exist.