The argument about whether homosexuality is a "choice" is stupid regardless of genetics. Many things that are called choices aren't based in choice at all. If I choose to eat a certain kind of food, it's not because I chose to like it better, I just do. If I choose to buy warmer clothes, it's because I'm cold, not because I chose to be cold. Likewise, if I then choose not to eat pie or not to dress warm, I'll sill want to eat pie, and I'll still shiver.
The only choice is your actions
Either way, whether or not it is genetic is irrelevant. It's just like asking if my favorite foods are genetic. It's only relevant in the effort learn the mechanisms behind things.
"I strongly believe given the choice most straight couples will privately opt out."
That's an interesting thought. It may cause some abortions, but I wonder how many. Many who are against homosexuality are against abortion as well. Would that mean in the future most gays will be born to religious parents?
Another outcome is that people, looking at what the genes actually do, might search for a way to counteract the effect of the gene. That will lead to some interesting ethical questions no doubt.