Introduction: Free sex among adolescents is increasing. In adolescence occur physical changes that influence the development of sex life. Great curiosity can lead to the occurrence of sexual deviance. It will be worst if not given the proper information to avoid free sex. The purpose of this study was to explain the effect of make a match learning method in the prevention of free sex in junior high school students. Method: This study used quasi experimental with two group pre-post test design. The population were 7th grader in SMP Negeri 2 Kebomas Gresik and the sample were 66 students for two classes. The sample were taken by simple random sampling. Make a match learning method as independent variable and prevention of free sex as dependent variable. Data were collected used questionnaire, and analyzed used Wilcoxon Signed Rank Test and Mann Whitney with significant level ≤0,05. Results: The result were knowledge (p=0,000) and attitude (p=0,000) for intervention group. It means that there was a significant change in the level of knowledge and attitude of students. While in control group, knowledge (p=0,004) and attitude (p=1,000). It means that there was a change of knowledge but no change in the attitude of students. Discussion: The result showed that make a match learning method is effective to increase knowledge and attitude to prevent free sex. This research recommended to be applied to adolescents to improve their knowledge and attitude about prevention of free se
