The absence of marriages will result in all kinds of financial burdens that gay people wouldn't face if they could get married. If my brother gets hit by a car tomorrow, my sister-in-law will go on living materially in the same way that she does now. If the same thing happens to me, a great deal of what I have will go off to the taxman. That's because of one of, as you doubtless know, eleven hundred federal laws that favor marriage.