So it all comes back down to only those who have children or capable of having children. That means sterile people can't get marry.
Sterile people getting married still benefits society. Since marriage is a social contract where the parties involved enter a monogamous relationship, there is expectation that neither will become destructive to other marriages by having adulterous relationships - especially if the other marriages do have children. Now I know you're already going to say BUT some married people cheat anyways. Yes, some married people do but that doesn't mean the expectations and laws of marriage shouldn't exist. It's like saying we should do away with laws that state stealing is a criminal offense because people are bound to steal anyways.
Also, heterosexuals, even if sterile, provide the ideal environment to raise children even if through adoption or foster care. This isn't to say that homosexuals aren't good parents. It's saying that heterosexual couples are the ideal. Example: it's the ideal that a black kid is raised by a black couple rather than a white couple. We know that this is an ideal match though circumstances might otherwise warrant alternatives.
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On another note, the title of this thread is nonsense. To be ANTI-GAY is to cause direct and intentional harm to gays, which none of the arguments have. We are not talking about the Matthew Shepherd case and violent acts where gays are being lynched in the public square. Gays enjoy the same freedom as we do and in fact, many have excelled further than the likes of you and me!
Suze Orman, Rosie O'Donnell, and Ellen Degeneres do not need your sympathy as they are capable lesbians that have reached levels of success you and I will never see in our lifetime. So for any gays and supporters to make outlandish claims that we live like it's the 1800s is ludicrous. If that was true, these lesbians wouldn't have Emmy-award winning shows that rake in billions of dollars. In fact, for some of them it is their "gayness" that has catapulted their careers. Gays have enjoyed freedom and the freedom to marry and live with whomever they want for years before any of this disastrous political b.s. To say their movement is an echo of the Black Civil Movement is offensive.