I disagree. What about all the years before society made it acceptable?
A study needs to be done of parents of gays and see what they noticed over the years of development.
Again - how many teenagers do you know that seek to choose options that bring scorn on them their entire lives? They just want to be accepted by their peers. They are not accepted - no matter what society attempts to do.
How could you get a young normal teenager to avoid girls and instead only be interested in relationships of the same sex. It could not be done.
I have not noticed young men sitting down and deciding they would like girls - not men. I have seen young men totally enamored of a young girl and you could not make them be able to ignore them.
Now why is this? Did you make a choice sexually? I seem to remember having boyfriends in the first grade - and I did not make a "choice".