A couple that doesn’t want children when they marry might change their minds. Birth control might fail for a couple that uses it. A couple that appears to be infertile may get a surprise and conceive a child. The marital commitment may deter an older man from conceiving children with a younger woman outside of marriage. Even a very elderly couple is of the structural type (i.e., a man and a woman) that could theoretically produce children (or could have in the past). And the sexual union of all such couples is of the same type as that which reproduces the human race, even if it does not have that effect in particular cases.
Admittedly, society’s tangible interest in marriages that do not produce children is less than its interest in marriages that result in the reproduction of the species. However, we still recognize childless marriages because it would be an invasion of a heterosexual couple’s privacy to require that they prove their intent or ability to bear children.
There is no reason, though, to extend “marriage” to same-sex couples, which are of a structural type (two men or two women) that is incapable--ever, under any circumstances, regardless of age, health, or intent--of producing babies naturally. In fact, they are incapable of even engaging in the type of sexual act that results in natural reproduction. And it takes no invasion of privacy or drawing of arbitrary upper age boundaries to determine that.
Read more at Life Site News.