I suppose that Gay "spouses" have absolutely no problem telling any children they may raise that the natural order of things is a man mating with a woman? In your world, where the two "mates" cannot naturally produce a child of themselves, kids become more like pets than actual humans.
Gay marriage is an absurdity. Those who are intimately aware of the gay community know that promiscuity is the hallmark of the gay lifestyle, and that the change of partners invariably occurs often. A lasting homosexual relationship is like a snow in New York in July. Just ask a psychiatrist.
Maybe they should just get a pet monkey...It'll get in just as much trouble, do all sorts of cute, inventive things, and they'll save a fortune on school clothes.