[영문]This article examines the sociocognitive processes contributing to intention to use contraception and willingness to engage in unsafe sex, using extended versions of the theory of planned behavior (TPB) and the Prototype/Willingness model (Gibbons qqqamp; Gerrard, 1995, 1997). Data were obtained from a questionnaire delivered to all the pupils in ninth grade (N = 196) at three schools in Oslo. Hierarchical multiple regression analysis was used to predict intention and willingness. The results showed that subjective norm was the most important predictor of intentions for girls, whereas moral norm was most important for boys' intentions and willingness. Prototypes were the most important predictor for girls' willingness. Implications of the findings are discussed.