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Because being homosexual is not really well accepted by most people. If parents could identify a gay fetus, many of them would abort it and try again. I can't prove that, of course, as it is a hypothetical, but it does seem likely. As it is, about a quarter of all fetuses are aborted. Parents would be more likely to abort one that they found "defective" in some way and try for a perfect one.
That's just an opinion, of course. There is no way to know for sure.
It's probably a fairly accurate opinion, I'd think.... but I don't think there will ever be a test that can tell you with any certainty "yes, this fetus will absolutely be gay." I don't think homosexuality is genetic or inborn to any definite degree. The "gay gene" has been sought and not found.
I'm not going to assert that certain prenatal conditions might not predispose someone more towards homosexuality than would otherwise be typical (hormone levels or other neuro-chemical variations) because it might be so even if unproven; but I think early environment, early experiences with socialization and sexualization (not sex per se, but intrest in the opposite or whatever gender) around ages 9-14, and yes a certain amount of choice are actually the ingredients that end up causing "orientation"... in as much as we can even define "orientation", a slippery term that some want to entirely divorce from behavior. That's part of the problem as I see it... people want to talk about orientation, which is a theory... when very commonly behavior (what people actually DO) is a lot more complex and a lot more likely to vary from presumed-orientation.
In short I don't think we know anywhere near as much about sexuality in general, and sexual orientation in particular, as many people think we do. In particular I think we're still a long way from understanding, in a medical/psychological/sociological sense, what makes some people LGBT.