While quoting Camille Paglia in my dissertation, I chanced up on another comment I had flagged in her landmark, Sexual Personae: Art and Decadence from Nefertiti to Emily Dickinson:
Marriage is the social regulation and placement of sexual energies, which for [English poet Edmund] Spenser otherwise fall back into the anarchy of nature, rule by the will-to-power and survival of the fittest. Marriage is the sanctified link between nature and society. Sex in Spenser must always have a social goal.
Save perhaps for Jonathan Rauch, gay marriage advocates have yet to defend marriage in such terms. Perhaps, they might get a better response from the American people if they did.