Note the recent exchange in their joint blog where Richard Posner and Gary Becker analyze whether there are rational reasons (i.e. per economic analysis) to block same-sex marriage. Posner considers "whether widespread recognition of gay marriage, and thus the legitimating of homosexual relationships, might either increase the number of homosexuals or undermine heterosexual marriage. I do not think either consequence is likely…. Homosexuals are more open about their sexual identity and this creates an impression that there is more homosexuality than there used to be–and there may indeed be more homosexual behavior. But the preference appears to be unchanged. So parents probably need not worry that recognizing gay marriage will increase the likelihood of their child's turning out to be homosexual." Whew!
Becker agrees that same-sex marriages should be allowed, and argues that opposition to it has no basis other than as an expression of prejudice. His solution to pretty much any marriage debate is to substitute private contracts for the legal status. With that starting point, Becker sees no reason to preclude gay couples from partaking of the joy of negotiation and the bliss of bargained-for agreement. No reason to bar polygamy either, he suggests.
Nothing new here, but the man-bites-dog aspect of conservatives endorsing same-sex marriage (even though it should be no big surprise coming from these two) may garner some attention.