The winnowing hypothesis posits that transitions from dating to cohabiting to marital unions are marked by increasing selectivity in the mate selection or matching process. In this paper, we provide comparative estimates of educational, racial, and religious homogamy and heterogamy along a continuum of commitment: sexually intimate dating couples, cohabiting couples, and married couples. Log-linear models, fitted to cross-classified data from the 1995 National Survey of Family Growth, provide only partial support for the winnowing hypothesis. On the one hand, homogamy with respect to race and religion increases slightly as relationships progress from dating to cohabitation to marriage. On the other hand, each relationship–dating, cohabiting, and married–is marked by substantial homogamy, at least for the traits considered here. And, in the absence of homogamy, each couple type reveals quite similar patterns of educational heterogamy or intermarriage, although upward mobility through partnering is less evident among cohabitors. Overall, however, the rather stringent sorting criteria that men and women use in selecting a marital partner, which manifests itself in marital homogamy, is also used in dating and cohabiting relationships.
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Blackwell et al. (2004) studied this question.
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