Just saw this opinion piece, https://www.cnn.com/2013/03/20/opinion/george-gay-marriage?iref=obinsite. The article is in large part actually about polygamy, but these quotes on the gay marriage issue echo some of what I was saying in my earlier post in this thread:
The attractive civil rights rhetoric of "marriage equality" masks a profound error about what marriage is. Of course, if marriage were simply about recognizing bonds of affection or romance, then two men or two women could form a marriage just as a man and woman can.
...
But marriage is far more than your emotional bond with "your Number One person," to quote same-sex marriage proponent John Corvino.
...
All human beings are equal in dignity and should be equal before the law. But equality only forbids arbitrary distinctions. And there is nothing arbitrary about maximizing the chances that children will know the love of their biological parents in a committed and exclusive bond. A strong marriage culture serves children, families and society by encouraging the ideal of giving kids both a mom and a dad.