Marriage, Men and Making Babies.

Law Professor Nelson Lund makes the following observation:

Without marriage, men often would be uncertain about paternity or indifferent to it. If left unchecked, many men would have little incentive to invest in the rearing of their offspring, and the ensuing irresponsibility would have made the development of civilization impossible.


The fundamental purpose of marriage is to encourage biological parents, especially fathers, to take responsibility for their children. Because this institution responds to a phenomenon uniquely created by heterosexual intercourse, the meaning of marriage has always been inseparable from the problem it addresses.

Homosexual relationships (and lots of others as well), have nothing to do with the purpose of marriage, which is why marriage does not extend to them. Constitutional doctrine requires only one conceivable rational reason for a law, and the traditional definition of marriage easily meets that test.