Marriage better supports individual and social wellbeing, and the government can and should reinforce its value through economic incentives. Cohabitation, not so much.In the wake of the sexual revolution, the increasing popularity of cohabitation is an alarming trend. Cohabitation, the practice of a romantically involved couple living together while unmarried, has doubled since 1995, with 12 percent of adults under the age of 30 living with their sexual partners. As cohabitation has become more accepted by Americans, there is also increasing support (from 65 percent of American adults, to be precise) for cohabitating couples receiving the same economic and tax...