Teenage pregnancy, which occurs among adolescents under 20, has far-reaching effects on maternal and child health, society, and the economy. It is linked to unprotected sexual intercourse, sexual coercion, peer pressure, and poverty, making it a global health issue that can be prevented. This study aimed to evaluate the perceived impact of sex education on the occurrence of teenage pregnancy among students in selected secondary schools in Ogbomoso North Local Government. A descriptive design was adopted, and data were collected using a self-structured questionnaire with informed consent. The findings revealed that 75% of respondents were introduced to sexuality education primarily through social media. Additionally, 51% believed that sex education increases knowledge of sexual and reproductive health and rights. Overall, 60% of respondents had a positive perception of sex education, while 40% had a poor perception. Three null hypotheses were tested, and the results showed no significant relationship between the age of the respondents and their awareness of sex education. Based on the findings, it is recommended that sensitization programs be implemented by government agencies and private stakeholders to educate young people on the importance of comprehensive sex education in preventing teenage pregnancy.