Many libertarians and conservatives, including Britain’s Prime Minister David Cameron, assert that marriage is a conservative institution—which is true—one that will therefore function as such for those who enter it, whether gay or straight. While certainly the case for some, that claim is an unlikely future for many, not because gay or lesbian couples are liberal but because those in the driver’s seat of the contemporary mating market—men—are permissive. This, I predict, will be same-sex marriage’s signature effect on the institution—the institutionalization of monogamish as an acceptable marital trait. No, gay men can’t cause straight men to cheat. Instead, the legitimacy newly accorded their marital unions spells opportunity for men everywhere to bend the boundaries. Dan Savage will be proud.Part of Ford's answer, at ThinkProgress:
...Regnerus may have put the cart before the horse. Society has long stigmatized the gay community, inherently discouraging monogamy among same-sex couples. It was easier for gay people to have secret sexual liaisons than build a consistent life with a person of the same gender that might out them. Over time, the gay community has sought out monogamy in spite of societal expectations, and Dan Savage’s “monogamish” structure may well have evolved out of these competing dynamics.
Thus, Regnerus is blaming gay people for how they adapted to being condemned by society to justify continuing to condemn them. Rather than acknowledge this tautology and instead promote marriage and monogamy for all couples, he continues to feed the feedback loop. Given that even opponents of marriage equality believe it to be inevitable, Regnerus is solving nothing by clinging to the past.