5.1 Distinguish the three ideal types of marriage that have existed throughout U.S. history
5.2 Describe and provide examples of how the ties between marriage, sex, and reproduction have weakened since the mid-20th century
5.3 Discuss how marriage markets structure romantic partnering
5.4 Describe major trends in how marriage and cohabitation are shaped by education
5.5 Describe major trends in how marriage and cohabitation are shaped by race and ethnicity