Contrary to conventional wisdom that living together before marriage will screen out poor matches and therefore improve subsequent marital stability, there is considerable empirical evidence demonstrating that premarital cohabitation is associated with lowered marital stability. . . .
“Marriages that are preceded by living together have 50 percent higher disruption rates than marriages without premarital cohabitation,” said noted demographer Larry Bumpass from the University of Wisconsin-Madison and sociologist Andrew Cherlin of John Hopkins.
Glenn T. Stanton, “The Ring Makes All the Difference,” pg.60, 61