Advocates for same-sex marriage should feel embarrassed by current efforts to recycle the three most discredited ideas of the “Free Love” Revolution of the 1960’s. Most Americans look back at the radical notions of that rebellious and drug-soaked era with skepticism and discomfort, if not outright regret. The sweeping changes in intimate relationships may have provoked excitement some forty years ago, but those alterations produced so many painful costs in terms of shattered families, degraded culture and proliferation of sexually transmitted diseases that even the most enthusiastic revolutionaries have come to reconsider the advisability of encouraging copulation without consequences or...