Kan, M. L., & Cares, A. C. (2006). From "friends with benefits" to "going steady": new directions in understanding romance and sex in adolescence and emerging adulthood. En A. C. Crouter, & A. Booth (Eds.), Romance and Sex in Adolescence and Emerging Adulthood, risks and opportunities (pp. 241-256). New York, London: Lawrence Erlbaum Associates.