Cohabitation is preferred over marriage among nearly half of women age 15 to 44, according to a study conducted by the National Center for Health Statistics. Marriage is part of a first union for less than one-quarter of women in this age bracket. Unmarried couples are staying together longer and more are having children. Within three years of cohabitation, 40 percent of the women had gotten married, 32 percent still lived with their partner and 27 percent had left the relationship. Those with a college education are less likely to choose cohabitation and more likely to move quickly to marriage (USA Today, April 4).