Imagine a prenatal test that, like the one for trisomy 21 (Down's syndrome), could show a predisposition to gayness.
...Sure, it ought to be the case that defending the rights of parents to use this technology doesn’t ultimately undermine queer rights, but it seems hard to believe that in practice it won’t lead to support of the idea that one ought to try not to have a gay child—just as in practice the prenatal test for trisomy 21 (Down's syndrome) has led to a general attitude (at least among the vast majority of my very “progressive” childbearing acquaintances) that one ought to try not to have a child with trisomy 21. I have a friend whose young son has trisomy 21. This friend was out and about with her son one day when another woman looked at her and her son and—recognizing that the son has Down's syndrome—scolded my friend with the question, “Didn’t you get the test?!” I can fully imagine a scenario where, 30 years from now, a woman tells a friend her son has come out as gay, only to have the friend respond, “Didn’t you get the test?!” Could we really imagine that offering such a test would have no negative impact on how an already-homophobic culture views people who are gay (and their parents, for that matter)? In that sense, can we really imagine that supporting parents’ right to choose against homosexuality supports the message that gay people are as good as straight people?