I just read the first sentence of this column by Orson Scott Card on legalizing gay marriage and burst out laughing. Couldn't help it. I also enjoy the definition of marriage as a "permanent or semipermanent bond."
I think his main argument, despite the amusing first sentence, is that gay marriage shouldn't be allowed because it will confuse children, leading to more gay marriages and the eventual extinction of mankind. Evidently he doesn't believe that our mainly-heterosexual-preferences are mostly biologically inborn. Which makes me wonder how we got here to start with, and why it didn't all come tumbling down back before we had laws to force us into our evidently artificial heterosexual relationships. He promises to address the science of homosexuality in a later column, so maybe he'll discuss it there, but I don't think I'll look for that. (What was it Voltaire said? "Once, a philosopher. Twice, a pervert.")