Earlier quoted context omitted.
In reading your comment I was struck by the dilemma that this reality would bring. Those most opposed to homosexuality are those most opposed to terminating pregnancy (mostly). It would create quite a quandary for folks who are inclined to hold these two beliefs.
Your other comments make me think you're someone who appreciates an honest discussion, so thanks for that. I do have an honest question of the reverse. Those most in favor of homosexuality are also those okay with abortion. But if parents started aborting because they were homosexual, would there be any sort of moral/ethical issue? Other comments have rightly commented it could be inverse (selecting for homosexuality…
I brought it up elsewhere, but this is an idea suggested in the book "The Forever War" as a way to control the population expansion.
I don't have a problem with (the concept) people selecting OUT homosexual children because I believe that there are people who will remain who will select them IN.
On a deeper level, I suspect that homosexuality is more complex than a few genetic markers - that there are epigenetic pressures there as well, and that there is a social/biological reason for their existence.
Homosexuality isn't a recent development, it isn't some "modern" issue. The Native Americans had a very different take on homosexuals than we do currently. Our outlook has shifted several times in the last few hundred years as well (the interwar period in Europe as an example). There are even some stunning modern examples that are rather counter intuitive to those who are ill informed (Iran and its views on trans genders).