Introduction Sexual education and puberty education are central components of healthy adolescent development. In 1991, the field of sex education reflected both longstanding pedagogical goals—promoting physical health, emotional well-being, and informed decision-making—and the socio-cultural tensions of the time: shifting public attitudes about sexuality, emerging concerns about sexually transmitted infections (especially HIV/AIDS), and debates over values, parental rights, and the role of schools. This essay examines concepts and practices in sexual education for boys and girls around 1991, the scientific and social context shaping curricula, pedagogical approaches then in use, differences in gendered instruction, and the legacy of those practices for later developments.