Imagine the irony: we finally make everyone straight, and then everyone starts acting all prison-gay.
Re: OP, I suspect it would have a gradual effect--how gradual would depend on how much the test/procedure was promoted. But I imagine a larger number of people would make gay kids straight than the reverse. Result: next generation contains fewer gays, homosexuality is less familiar, larger number of people "straighten" their kids. Next generation is even straighter, gay culture struggles to be heard, and eventually it's whittled down to an all-straight population or something very similar.
Re: OP, I suspect it would have a gradual effect--how gradual would depend on how much the test/procedure was promoted. But I imagine a larger number of people would make gay kids straight than the reverse. Result: next generation contains fewer gays, homosexuality is less familiar, larger number of people "straighten" their kids. Next generation is even straighter, gay culture struggles to be heard, and eventually it's whittled down to an all-straight population or something very similar.
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