Gay or Down Low?

Are supposedly straight men who allow gay men to give them blowjobs gay as well? Or is this "acceptable" straight man behavior? Are they bisexual?

And does this change for women? Do women, who have other women go down on them, become bisexual by these sexual choices?

Is sexuality a mindset? Do you know if you're gay, straight, or bi based on how you think? Is it about who you're attracted to? Can you know this without ever experiencing it?

This question has been on my mind forever. How can I know if I'm sexually attracted to women when my rational mind and traditional Asian cultural upbringing tells me not to act on it?

It's a tug-of-war, and I am exhausted.