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This longitudinal study examined the effect of the birth of the 1st child on relationship functioning using data from 218 couples (436 individuals) over the course of the first 8 years of marriage. Compared with prebirth levels and trajectories, parents showed sudden deterioration following birth on observed and self-reported measures of positive and negative aspects of relationship functioning. The deterioration in these variables was small to medium in size and tended to persist throughout the remaining years of the study. Mothers and fathers showed similar amounts of change after birth. The amount of postbirth deterioration in relationship functioning varied systematically by several characteristics of the individual, the marriage, and the pregnancy itself. In a group of couples who did not have children, results indicated more gradual deterioration in relationship functioning during the first 8 years of marriage without the sudden changes seen in parents, suggesting that the results seen in the parent sample may be due to birth. Keywords: transition to parenthood, parent, relationship functioning, prediction

This study uses a new measure to examine how different types of reasons for cohabitation are associated with individual well-being and relationship quality in a sample of 120 cohabiting heterosexual couples (N = 240). Spending more time together and convenience are the most strongly endorsed reasons. The degree to which individuals report cohabiting to test their relationships is associated with more negative couple communication and more physical aggression as well as lower relationship adjustment, confidence, and dedication. Testing the relationship is also associated with higher levels of attachment insecurity and more symptoms of depression and anxiety. Men are more likely than women to endorse testing their relationships and less likely to endorse convenience as a reason for cohabiting. Keywords: cohabitation; couples; decision making; commitment