Sexuality is not cut and dry though.
I've had conflicted sexual interests my entire life. Short to stopping to borders I won't cross (transexual or shemales).
I don't classify my life as being a straight guy then through events chose my sexuality.
I also don't believe many people go this route. Events and experiences only go so far to shape a person. The rest is actually attributed to who you are as a person.
Yup it’s definitely not binary (or trinary or whatever you call that).
It’s all more of a sliding scaling thing and that’s kind of exactly why I don’t think you are simply born into one hard fast pre-determined lean.
You just through some experience change just how much you lean in any one direction and that will change over time as you get older just like anything else.
So yes if we look at it in a purely binary context of full left and full right then one can come to the conclusion one has to be born that way.
If however you embrace the reality of it not being binary to begin with and is in fact a moving target then one also has to accept you can’t have been born to anything as it was never a static value to begin with.
What’s to say today I only mildly fancy Tom Hardy and tomorrow through some existential experience I decide that now I’m ready to want to pomp him?
Nothing actually, it could happen to just about anyone.
Like all things in life your views and opinions change as you motion through it.