Traditional Marriage regulates society - gay marriage doesn't
We should note that Sorokin made these arguments long before anything like homosexual marriage had been openly discussed. Sorokin’s insight was the realization that civilization requires men to take responsibility for their offspring. This was possible, he was convinced, only when marriage was held to be the unconditional expectation for sexual activity and procreation. Once individuals–especially males–are freed for sexual behavior outside of marriage, civilizational collapse becomes an inevitability. The weakening of marriage–even on heterosexual terms–has already brought a harvest of disaster to mothers and children abandoned in the name of sexual liberation.
The regulation of sexuality is thus a primary responsibility of any civilization. In their review of Western civilization, Will and Ariel Durant noted that sex is “a river of fire that must be banked and cooled by a hundred restraints.” The primary restraint has always been the institution of marriage itself–an institution that is inescapably heterosexual and based in the monogamous union of a man and a woman as husband and wife.