Purpose: The aim of this study was to identify contraception behaviors in unmarried men and women. Methods: A descriptive qualitative study design was used. Individual in-depth interviews with fifteen participants were conducted. Content analysis was utilized to determine the main outcomes. Results: For men, three themes were consistently seen as contraception behaviors: ``men desired sexual intercourse greatly``, ``men would not use a contraceptive device, even though they knew it was necessary``, and ``men gradually considered contraceptive use to live their lives without interruption``. For women, the three themes were as follow: ``women had sex half willingly while half did not have sexual inter course for the first time``, ``women did not use contraceptive devices because of ignorance of contraceptive methods``, and ``women did not carefully consider contraceptive use``. Conclusion: To prevent unmarried men and women from having unplanned pregnancies, tailored sex education programs should be established throughout Korea. All things considered, the effect of multimedia sex education should be considered to maximize the use of contraceptive devices.