National review has an excellent editorial up making the case for traditional marriage – and one of the points they make is like one I have made a number of times before concerning the primary purpose of marriage – that it exists to protect and promote the raising of children. Of course, they make the point more eloquently than myself:
One prominent supporter of same-sex marriage says that the purpose of marriage is to express and safeguard an emotional union of adults; another says that its purpose is to make it more likely that people will have others to give them care in sickness and old age.
So at the risk of awkwardness, we must talk about the facts of life. It is true that marriage is, in part, an emotional union, and it is also true that spouses often take care of each other and thereby reduce the caregiving burden on other people. But neither of these truths is the fundamental reason for marriage. The reason marriage exists is that the sexual intercourse of men and women regularly produces children. If it did not produce children, neither society nor the government would have much reason, let alone a valid reason, to regulate people’s emotional unions. (The government does not regulate non-marital friendships, no matter how intense they are.) If mutual caregiving were the purpose of marriage, there would be no reason to exclude adult incestuous unions from marriage. What the institution and policy of marriage aims to regulate is sex, not love or commitment.
An excellent and presumably obvious point – more great stuff follows, go read and learn.