Sexual self-concept--defined as an individual's evaluation of his or her own sexual feelings and actions--is proposed as an important predictor of contraceptive behavior among teenagers, and a scale measuring the concept is described. In exploratory analyses among university students, sexual self-concept is found to be associated with frequency of contraceptive use and use at most recent intercourse. It is also associated with their choice of contraceptive--students who had used prescription methods at last coitus had significantly higher scores on the sexual self-concept scale than did those who had used nonprescription methods or no method. These findings, together with the finding from analysis among high school students that sexual self-concept appears to improve with age, suggest that younger teenagers may be poorer users of contraceptives because of a lower sexual self-concept. Counseling and sex education that address social and psychological issues may help improve adolescent contraceptive practice by addressing teenagers' views of their own sexuality.