In an Economist story headlined “Gay Marriage: And Now on to Polygamy,” a gay-marriage supporter is finally comfortable enough to admit:

Obviously the legalisation of same-sex marriage represents a major change in the institution and in the meaning of the word, much as the meaning of phrases like “all men are created equal” changed significantly when they began to be understood to include, say, women. For people who have a strongly gendered understanding of their own marriage, this is a paradigm shift. The government is now saying it understands marriage as a long-term legal commitment between two people who are assumed to have a sexually attached relationship to each other. Gender is irrelevant; marriage is simply a paired relationship. It’s a big deal when social institutions change this way, and if conservative heterosexuals feel their marriages are affected, they’re right, even when the way they phrase their complaints is wrong.