Okay, so you know how the homophobic Christian Right clutches its pearls and bleats that if teh gayz are allowed to marry for realz, it will, like, totally destroy the institution of marriage for everybody, forever? So we have to keep gay marriage illegal because the sanctity of traditional straight marriage simply won't survive otherwise?
Well, it turns out that in the big wide real world that the fundies like to pretend they don't inhabit, things actually seem to work a little differently.
Now of course, correlation is not causation, and you couldn't say that if the states with gay marriage bans were to allow gay marriage, then overall divorce rates would start to reverse. I think it's more of an indicator that many of the states with gay marriage bans have a high fundamentalist demographic, and the rigidly patriarchal marriages that exist in that culture are not exactly the portrait of perfect connubial bliss they want everyone to believe they are.
But it does tend to throw a bit of cold water — like, enough to fill Lake Erie — on the claim that gay marriage is some kind of heterosexuality killer. One has to wonder what folks who say things that stupid are so desperate to suppress.