From the article:
“From the state’s perspective, marriage exists to unite a man and a woman as husband and wife, to then be equipped to be father and mother to any children that union might produce. It’s based on the anthropological truth that men and women are distinct and complementary. It’s based on the biological fact that reproduction requires a man and a woman. It’s based on the social reality that children deserve their mother and father.”
The key point is that marriage arises from anthropology—the reality of men and women, the reality of sexual complementarity, the fact that only man and woman can engage in marital acts which may produce children and form new families, and that the families thereby created will have mothers and fathers. It’s a consequence of the way that human beings are made—as men and women. The fact that every conjugal act does not create a child, or that some couples may be infertile, is immaterial. Only man and woman can engage in conjugal relations. Same sex couples never can. Such a relationship can never be marital. It’s impossible.