Correct. I am saying that you cannot assume and teach that it is genetic without proof. If they can prove it, then by all means, teach it. Until then, it is pure choice, as we know people can choose to be gay.
If you believe it is simply a choice, do you know when you chose to be straight? What were your influences in making that decision?
I cannot think of when I made that decision, I just know I am attracted to women. I am absolutely positive it was the same for you.