Semantics

A great post from Andrew Sullivan on the meaning of the word "marriage":

My in-laws have always been supportive and loving and tolerant. They accepted me at Christmas and other occasions and were glad their son had found a partner. But it was not until we told them that we were "engaged" that something suddenly clicked. They finally had a way to understand us and our love because they had the linguistic architecture to make sense of it. I was going to be their son-in-law! With those words. I became family - not Aaron's friend, or roommate or boyfriend or lover or what-have-you. But his husband. And thereby their family as well.

That's the whole point.