Argument: Gay marriage is no private matter, but a public issue
Margarette Somerville. "The case against gay marriage." McGill Center for Medicine, Ethics and Law. April 29, 2003: "marriage is not just a matter of private decision-making, it is also of concern to society. That becomes most apparent when a marriage breaks down and ends up in the divorce courts. [...] If society has a valid interest in marriage, as I believe it does, it must remain involved in marriage through the law."