Straight, bi or gay is simply a matter of what you are sexually attracted to. It is no more complicated than that.
Does that change over time? I don't know. I probably doubt it but maybe.
However, that doesn't mean you necessarily know which you are, and even if you do know you may choose to supress that knowledge for a variety of reasons. Or perhaps just simply not admit it to yourself. Or perhaps you simply don't want to be so fool yourself.
If you mean how can a gay man live as a heterosexual man and have an erection and then sex with a woman, then I guess it's called faking it. Even if you don't know that you are. A person can be turned on as much by what they're thinking as by what they're doing.
I imagine that not everybody can pretend, or want to, but I don't find it difficult to believe or understand that some can and do.
You'll notice it's called "coming out". A matter of revealing / admitting / understanding something, not suddenly becoming it.
My gay friends who are reasonably around my age seem to mostly have had a traumatic teen/early 20s, those materially younger then me seem not to have had anything like the same level of issues.
I think generally women are somewhat more fluid than men.
I must admit to absolutely no interest in someone else's sexual preferences (unless I'm hoping that it's me.), A person fancying men or women is about as interesting to someone else as is whether you fancy blondes or brunettes, surely?
Certainly sexuality is about as useful a way of judging people as the colour of their skin.
i.e. Not.
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