Adolescents attitude towards premarital sex has become a worrisome societal problem in Nigerian society, both to the students’ development and their over-all well-being. This study investigated the effects of Behaviour technique on secondary school adolescents attitude towards premarital sex. The design for the study is quasi-experimental, non-randomised pre-test and post-test, control group research. The sample comprised 64 students purposively selected from a population of 260 students