Most estimates say that somewhere between 3 and 5% of people prefer partners of the same gender. Is this argument really such a huge deal given that it deals with such a small segment of the population? Does gay marriage affect your benefits that much?
Yes, my suspicion is that this fraud thing is a bit of a make weight argument. It applies to any situation where a class of citizens gets something by being in it, rather than outside it. It creates an incentive to cheat to get inside the class. So why is it so particularly salient with the relative handful of gays that want to hook up?