A number of empirical researches and literature reviews indicate that personality can predict personal values, and then person's behaviour can be predicted from the personal values adhered to that person. However, researches those relate these variables in the field of sexual behaviour—and more specifically on premarital sexual behaviour—has not been found in Indonesia. This study is the first that places the degree of psychopathic personality as a predictor variable to the degree of sexual values dimensions (absolutism, hedonism, relativism), and degree of sexual values dimensions as predictor variables to the degree of premarital sexual behaviour in its hypothetical models. Predictive correlational design was used in this study. Study sample consisted of 267 unmarried urban adolescents (97 males, 170 females; M = 20.50 years old, SD = 1.37 years old) taken conveniently from five campuses in Indonesia's capital Jakarta and its surrounding areas. The results showed that the hypotheses were supported by empirical data. In addition, psychopathy had a direct effect on premarital sexual behaviour.