Abstract:The linkages between self-regulation in childhood, risk proneness in early adolescence, and risky sexual behavior in midadolescence were examined in a cohort of children (N = 518) from the National Longitudinal Survey of Youth. The possible mediating role of two early adolescent variables (substance use and negative peer pressure) was also examined. Self-regulation was assessed by maternal report at ages 8-9, and risk proneness, comprising aspects of sensation seeking and decision making, was assessed by adolescent self-report at ages 12-13. Structural equation models predicting risky sexual behavior at ages 16-17 indicated that self-regulation operated partly through early adolescent substance use, whereas risk proneness operated through early adolescent substance use and negative peer pressure. The overall model did not differ signifi cantly for boys and girls, although there were gender differences in the strength of particular paths. These longterm longitudinal results support the importance of early self-regulation and risk proneness in setting the stage for adolescent sexual risk taking and implicate substance use and negative peer pressure as processes through which risk proneness and poor self-regulation lead to risky sexual behavior.In recent years, self-regulation, defi ned as the ability to regulate one's attention, affect, and activity in accordance with internal and external demands, has emerged as an important determinant of children's psychosocial adjust- ment. Theoretical models (e.g., Block & Block, 1980;Demetriou, 2000;Kopp, 1982) suggest that self-regulation facilitates adaptive responses to life's challenges, and several reviews of the literature support a link between self-regulatory capacity and children's competence (Barkley, 1997;Baumeister, Leith, Muraven, & Bratslavsky, 1998;Shonkoff & Phillips, 2000). To date, empirical work has tended to focus on childhood, with less attention devoted to the developmental consequences of self-regulatory capacity in adolescence. However, several studies have supported an association between self-regulation (or related constructs) and adolescent adjustment. For example, children low in ego control report elevated substance use and externalizing behavior as adolescents (Block, Block, & Keyes, 1988;Caspi, Henry, McGee, Moffi tt, & Silva, 1995). Building on this work, the present study investigated the link between childhood self-regulation and risky sexual behavior in adolescence.Risky sexual behavior such as early intercourse, unprotected intercourse, or sex with multiple partners contributes to high rates of pregnancy and sexually transmitted infections among adolescents in the United States (Grunbaum et al., 2004;Moore, Manlove, Terry-Humen, Williams, Papillo, & Scarpa, 2001). Prior work has documented a prospective association between poor self-regulation (or low self-restraint) in early adolescence and subsequent risky sexual behavior (Feldman & Brown, 1993;Raffaelli & Crockett, 2003). Here, we extend the temporal canvas to examine the relat...