Adolescent sexuality and reproductive health are important in order to combat increase in risky sexual activities and cases of sexually transmitted infections (STIs). It has been observed that adolescents in secondary schools engaged in risky sexual behaviours which are pre-marital sex, multiple sex partners, transactional sex, teenage pregnancy, abortion and sex under influence of alcohol and hard drugs. The study was carried out to examine the knowledge of and attitude towards risky sexual

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... aviour among adolescent in selected secondary schools in Odeda, Ogun State. A descriptive cross-sectional design was used for this study. The population comprised 384 adolescents from selected secondary schools in Odeda local government, Ogun state. A semi-structured and self-administered questionnaire was validated and used to collect data. Data collected were analysed using descriptive and inferential statistics. The results showed that there was generally high level of good knowledge (60.5%) and practice (60.2%) of sexual behaviour among the respondents. Also, in terms of attitude, the respondents in this study had a positive view of it. A significant relationship existed between the level of knowledge and practice of risky sexual behaviour among the respondents (p= 0.000) and the attitude towards risky sexual behaviour among the respondents (p= 0.002). The study concluded that the adolescents in selected schools have adequate knowledge on risky sexual behaviour while their attitude towards risky sexual behaviour is also good. It was recommended among others that continuous awareness through sex education should be included in school-based teaching in order to have a total compliance on risky sexual behaviour. Keywords: Adolescents, Attitude, Knowledge, Risky Sexual Behaviour,