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Keywords:

  • cohabitation;
  • gay;
  • lesbian;
  • bisexual;
  • transgender;
  • marriage;
  • social support;
  • social trends/social change;
  • stability

This study contributes to the emerging demographic literature on same-sex couples by comparing the level and correlates of union stability among 4 types of couples: (a) male same-sex cohabitation, (b) female same-sex cohabitation, (c) different-sex cohabitation, and (d) different-sex marriage. The author analyzed data from 2 British birth cohort studies: the National Child Development Study (N = 11,469) and the 1970 British Cohort Study (N = 11,924). These data contain retrospective histories of same-sex and different-sex unions throughout young adulthood (age 16–34) from 1974 through 2004. Event-history analyses showed that same-sex cohabitations have higher rates of dissolution than do different-sex cohabiting and marital unions. Among same-sex couples, male couples had slightly higher dissolution rates than did female couples. In addition, same-sex couples from the 1958 and 1970 birth cohorts had similar levels of union stability. The demographic correlates of union stability are generally similar for same-sex and different-sex unions.