Earlier quoted context omitted.
I don't think it is entirely genetic. There are other factors like development within the mother's body, levels of hormones / chemicals, and so on which could contribute to a different sexuality later on. This doesn't mean you can change it, and messing with chemical levels in the hope of finding a configuration which leads to "normality" would be very unethical in my eyes.
> There are other factors like development within the mother's body, levels of hormones / chemicals, and so on which could contribute to a different sexuality later on. Those could still be influences if it was purely genetic. Biological sex is approximately fully genetic (not quite, but very close to it), but womb environment (I remember pH differences specifically being identified as an influence) play a role in wh…
On many complex species, the genere isn't defined by the genes.