Ever since writing this article in 1996, I've been concerned that G&L people might demand marriage but then neglect it. More recently, some SSM opponents have claimed this is exactly what happens. From the Williams Institute at UCLA, here's welcome evidence that they're wrong (PDF format), at least so far. Study co-author Gary Gates summarizes:
We analyze data from states that have extended legal recognition to same-sex couples. We show that same-sex couples want and use these new legal statuses. Furthermore, they react more enthusiastically when marriage is possible. More than 40% of same-sex couples have formed legal unions in states where such recognition is available. Same-sex couples prefer marriage over civil unions or domestic partnerships. In the first year that marriage was offered in Massachusetts, 37% of same-sex couples there married. In states that offered civil unions, only 12% of same-sex couples took advantage of this status in the first year and only 10% did so in states with domestic partnership registries.
It takes generations to establish a culture of marriage in a social milieu where marriage has always been not just illegal but inconceivable. Low take-up rates, by themselves, would not vitiate the case for SSM. But it is good to know that gay culture is already responding to this powerfully life-enhancing institution.