Penelitian ini merupakan penelitian kuantitatif dengan rancangan penelitian cross sectional. Lokasi penelitian di SMA Kecamatan Jatiasih Kota Bekasi dengan sampel 180 responden yang dipilih melalui simple random sampling. Tujuan penelitian adalah mengetahui determinan yang berpengaruh dan paling dominan terhadap perilaku seksual pranikah remaja. Hasil penelitian menunjukkan adanya 34,4 remaja memiliki perilaku seksual pranikah dengan risiko tinggi yang diantaranya sekitar 33,9 telah melakukan cium bibir, 16,1 cium leher sampai dada, 13,3 meraba area sensitif, 7,2 menempelkan alat kelamin, dan 5,6 melakukan hubungan seksual. Variabel yang paling dominan adalah peran teman sebaya, dimana remaja yang memiliki peran teman sebaya tinggi memiliki peluang 4,6 kali lebih tinggi untuk melakukan perilaku sekspranikah berisiko tinggi dibandingkan dengan responden yang memiliki peran teman sebaya rendah setelah dikontrol variabel pengetahuan, sikap, dan keterpaparan media pornografi.

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This research was conducted by using quantitative method and data analysis was based on cross sectional design. The location of this research was is Senior High School in Jatiasih Bekasi with 180 samples that was selected through simple random sampling. Theo bjectives of this study were to find out the relationship between the determinants with the premarital sexual behavior of adolescents and to find out the dominant variable of premarital sexual behavior of adolescents. The results showed that 34,4 of adolescents had high risk premarital sexual behavior, of which about 33,9 had kissed the lips,16,1 kissed the neck to the chest, 13,3 touched sensitive area, 7,2 had petting, and 5,6 had sexual intercourse. The most dominant variable is the role of peer group, where adolescents with high role of peer group have 4.6 times higher for having high risk premarital sexual behavior than adolescents who have low role of peer group after controlled by variables of knowledge, attitude, and exposure of pornographic media.