The most innovative aspect of the RDSL study design was the second component of data collection—dynamic measurement of current pregnancy desires and pregnancy status, as well as characteristics of current relationships such as commitment level, sexual involvement, and contraceptive use —collected in weekly five-minute surveys over the following 30 months. Black young people are at a much higher risk of acquiring a sexually transmitted infection STI than their white peers CDC , partly because of higher rates of concurrency and more assortative mating than other racial groups Hamilton and Morris ; Laumann and Youm Seven respondents were not included in our analytic sample because they completed only one journal in the first 12 months of the study. Measures Individual Characteristics Table 1 presents the distributions of race and other sociodemographic characteristics included in the models, among the full sample and separately by race. Religiosity may have a differential racial impact on both young sex and contraceptive use. First, we developed a rich set of measures integrating the relationships, sexual intercourse experiences, and contraceptive use of to year-old women over the first year of the RDSL study. Religious doctrine also tends to be negative toward contraception, but evidence is mixed about whether religiosity affects contraceptive use among those young people who have sex Manlove et al. In the United States, black young people grow up in more religious families than their white counterparts, with the vast majority attending historically black churches e. Black women were more likely to use less effective methods for pregnancy prevention e. After all, South Africa is the home of apartheid, the Group Areas Act , which corralled different racial groups into different geographical areas, and the Immorality Act , which made it illegal for black and white people to marry or have sex. While some people seemed to appreciate us tackling a topic that affects so many, others were quick to dismiss it as racist and unnecessary. More discontinuation of contraceptive use, a greater number of different contraceptive methods used, and more method switches. Hypothesis 4 Contraceptive Use and Method Instability: Hypothesis 3 Contraceptive Method: Her music is shit but her dreams came true.