RESUMEN
Objective: The youths' sexual behaviors are counted as the main priorities of the public health due to the high prevalence of unwanted pregnancies, illegal abortions, and sexually transmitted infections. This research was carried out to explain the youths' contraceptive knowledge and practice in premarital sexual relationships. Methods: This qualitative research was carried out on 30 single boys and girls aged 18–24, living in Isfahan, Iran, who had already started sexual activities. Data collection was done with semi-structured interviews. The data were analyzed by using conventional content analysis. Results: Two main categories were extracted including inadequate awareness regarding contraception (with subcategories “unreliable information sources” and “gender inequality in familiarity with contraceptive methods”) and inappropriate contraceptive practice (with sub-categories “use of unreliable contraceptive methods” and “gender inequality in applying contraceptive methods”). Conclusion: Sexual health education programs should equip the youths with adequate knowledge on contraception and use of reliable contraceptive methods. Furthermore, attempts should be made along with tackling gender inequality is very significant for youths' sexual and reproductive health security.