During a one-year period, about 35 out of every 100 cohabiting couples have experienced physical aggression, compared to 15 out of every 100 married couples. 5
5 Physicians For Life. (2004). Cohabitation Vs. Marriage: 26 Research Findings Retrieved December 22, 2004 from http://www.physiciansforlife.org/content/view/242/27/