Drink much Brasky?
Sort of. That was tequila.
Never, ever, give me tequila.
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Anyway, yeah. Fluid.
Being that I lust after women so badly, I dont see me ever going there. It just doesnt trip my trigger thinking about guys. However, I think these are learned responses in conjunction with a predisposition. You're pretty much born with the predisposed "gay gene" whatever it is, I wont pretend to understand it. But I dont think you necessarily need the "gene" to allow your nurture and your formative years to color your desires. Thats the rift where some people learned it was okay to experiment, and others didnt or havent. The further you get along the path, the less likely you'll experiment. Not always, but "mostly". And for that experimentation to take root and develop into a larger piece of your sexual identity, it's most likely that you'll have to do it early.
On the other side of the coin are the closeted, the repressed. They KNOW they want to experiment. They desire same sex relations, but fear or pride or some other scrambled bullshit prevents it. Sucks to be them.