Perilaku seksual pranikah di kalangan remaja merupakan masalah kesehatan reproduksi serius yang berisiko memicu kehamilan tidak diinginkan, infeksi menular seksual, serta tekanan psikologis. Penelitian ini bertujuan untuk menganalisis gambaran serta hubungan antara sikap terhadap perilaku, norma subjektif, persepsi kontrol perilaku, dan intensi dengan perilaku seksual pranikah pada siswa remaja dengan menggunakan pendekatan Theory of Planned Behavior (TPB). Jenis penelitian kuantitatif ini menggunakan desain studi cross-sectional yang dilaksanakan pada bulan April 2026 di beberapa sekolah menengah di wilayah Kecamatan X, Jakarta Barat. Sampel penelitian berjumlah 440 siswa remaja yang dipilih menggunakan metode multistage sampling, dengan analisis data meliputi uji univariat, bivariat (Chi-Square), dan multivariat (Regresi Logistik). Hasil analisis univariat menunjukkan mayoritas responden berada pada fase remaja pertengahan dengan proporsi tertinggi pada usia 17 tahun (44,1%), di mana bentuk perilaku seksual non-penetrasi didominasi oleh tindakan berpegangan tangan (56,4%), berpelukan (32%), dan merangkul (38,4%), sementara perilaku penetrasi telah dilakukan oleh sebagian kecil remaja baik menggunakan kontrasepsi (2%) maupun tanpa kontrasepsi (1,4%). Berdasarkan analisis bivariat dan multivariat, sikap pribadi (PValue = 0,139) dan intensi seksual ditemukan tidak berhubungan signifikan dengan perilaku seksual pranikah secara riil. Sebaliknya, norma subjektif lingkungan/teman sebaya terbukti menjadi prediktor paling kuat dan dominan memicu perilaku tersebut (PValue = 0,000; OR = 2,324), diikuti oleh persepsi kontrol perilaku yang kurang baik (PValue = 0,049; OR = 1,480). Kesimpulannya, faktor lingkungan sosial berupa norma subjektif kelompok teman sebaya (peer group) merupakan pendorong utama yang menormalisasi perilaku seksual pranikah pada remaja di Kecamatan Kembangan. Oleh karena itu, disarankan bagi Suku Dinas Kesehatan dan Pendidikan untuk merancang program edukasi kesehatan reproduksi komprehensif berbasis pendekatan teman sebaya (peer-led intervention) serta memperkuat kontrol diri remaja guna meminimalkan risiko perilaku seksual berisiko.

Premarital sexual behavior among adolescents constitutes a severe reproductive health issue due to the risks of unintended pregnancy, sexually transmitted infections, and psychological stress. This study aims to analyze the prevalence and relationship of attitude toward the behavior, subjective norms, perceived behavioral control, and intention with premarital sexual behavior among adolescent students using the Theory of Planned Behavior (TPB) framework. This quantitative study applied a cross-sectional approach, conducted in April 2026 across secondary schools in the X District, West Jakarta. A sample of 440 adolescent students was selected using a multistage sampling technique, and data were analyzed using univariate, bivariate (Chi-Square), and multivariate (Logistic Regression) analyses. Univariate analysis revealed that the majority of respondents were in mid-adolescence, with the highest proportion aged 17 years old (44.1%). Non-penetrative sexual activities were dominated by holding hands (56.4%), hugging (32%), and embracing (38.4%), while penetrative behavior (intercourse) had been initiated by a small fraction of adolescents, either with contraception (2%) or without contraception (1.4%). Bivariate and multivariate analyses indicated that personal attitude (P = 0.139) and sexual intention were not significantly associated with actual premarital sexual behavior. On the contrary, subjective norms from peers emerged as the strongest and most dominant predictor (P = 0.000; OR = 2.324), followed by poor perceived behavioral control (P = 0.049; OR = 1.480). In conclusion, environmental factors, particularly the subjective norms established within peer groups, are the primary drivers that normalize premarital sexual behavior among adolescents in Kembangan District. It is highly recommended that the Sub-department of Health and Education formulate comprehensive reproductive health programs incorporating peer-led interventions and strengthen adolescents' self-control to mitigate the risks of high-risk sexual behavior.