All right, you say, so cohabitation is a poor substitute for marriage and may even undermine those marriages preceded by cohabitation. But how does allowing persons of the same sex to marry harm the institution of marriage? As advocates of same-sex marriage (SSM) are quick to point out, “the sky hasn’t fallen” since SSM became legal in Massachusetts in 2004, apparently convinced that four short years is adequate to produce the predictable and deleterious public consequence of redefining marriage. Remember, however, that Unwin’s research demonstrated that the effects of such modification would occur over generations and not be immediate. Nonetheless, there is some empirical evidence already emerging that indicates the acceptance of SSM will, in fact, harm the institution of marriage and, subsequently, society.

Stanley Kurtz, senior fellow at Stanford University’s Hoover Institute, reported in April of 2004 before the House Judiciary Committee that there is ample evidence available in Scandinavia demonstrating the effect of devolving marriage to include couples of the same sex. Dr. Kurtz holds a PhD in social anthropology from Harvard University and is regarded as both an excellent scholar and expert in this area. Commenting on the situation in Sweden, Kurtz writes:

The Swedes have simply drawn the final conclusion: If we’ve come so far without marriage, why marry at all? Our love is what matters, not a piece of paper. Why should children change that? (Stanley Kurtz, “The End of Marriage in Scandinavia: The ‘conservative case’ for same-sex marriage collapses,” The Weekly Standard, 2 February 2004.)

Indeed, in Sweden the out-of-wedlock birthrate is 55 percent, Norway is 50 percent, Iceland is approaching 70 percent, and in Denmark 60 percent of firstborn children are born out of wedlock. So what? you ask. So cohabitation has replaced marriage, big deal; men and women are still having children, only without the formality of a marriage certificate. What’s the problem? According to Dr. Kurtz, studies in these countries demonstrate that these unmarried families break up at a rate two to three times that of married couples. This has only exacerbated the welfare state that is unparalleled in Scandinavia. Kurtz points out that “no western nation has a higher percentage of public employees, public expenditures, or higher tax rates than Sweden.”

And what does this have to do with SSM? All of the Scandinavian countries mentioned embraced de facto same-sex marriage, beginning with Denmark in 1989. The out-of-wedlock birth rates mentioned experienced their most dramatic increases in the decade following the acceptance of SSM in these countries. The separation of marriage from procreation and parenting was already increasing, as it is here; SSM only widened the separation. “In Scandinavia, gay marriage has driven home the message that marriage itself is outdated, and that virtually any family form, including out-of-wedlock parenthood is acceptable” (Kurtz, “The End of Marriage”). 

Dr. Kurtz offers further insight into the connection between cohabitation, rising out-of-wedlock birthrates, and same-sex marriage:

British demographer Kathleen Kiernan . . . divides the continent into three zones. The Nordic countries are the leaders in cohabitation and out-of-wedlock births. They are followed by a middle group that includes the Netherlands, Belgium, Great Britain, and Germany . . . North American rates of cohabitation and out-of-wedlock birth put the United States and Canada into this middle group. Most resistant to cohabitation, family dissolution, and out-of-wedlock births are the southern European countries of Portugal, Italy, and Greece . . . These three groupings closely track the movement for gay marriage. In the late eighties and early nineties, gay marriage came to the Nordic countries, where the out-of-wedlock birthrate was already high. Ten years later, out-of-wedlock birthrates have risen significantly in the middle group of nations. Not coincidentally, nearly every country in that middle group has recently either legalized some form of gay marriage, or is seriously considering doing so. Only in the group with low out-of-wedlock birthrates has the gay marriage movement achieved relatively little success.