Robert George is one of the three authors of a paper titled "What is Marriage?" for the Harvard Journal of Law and Public Policy. I haven't time to read it at the moment but looking at the abstract, I though it would be worth passing on to you:
In the article, we argue that as a moral reality, marriage is the union of a man and a woman who make a permanent and exclusive commitment to each other of the type that is naturally fulfilled by bearing and rearing children together, and renewed by acts that constitute the behavioral part of the process of reproduction. We further argue that there are decisive principled as well as prudential reasons for the state to enshrine this understanding of marriage in its positive law, and to resist the call to recognize as marriages the sexual unions of same-sex partners.I thought this would be a good post to feature the photo of a billboard that I downloaded a while back. It was put up in Harney County, Oregon.
Besides making this positive argument for our position and raising several objections to the view that same-sex unions should be recognized, we address what we consider the strongest philosophical objections to our view of the nature of marriage, as well as more pragmatic concerns about the point or consequences of implementing it as a policy.