Most studies of sex education center on local Anglo-Euro-American contexts, tracing the origin of sex education to a coordinated response to the spread of venereal diseases. These neglect the circumstances in which sex education developed in the developing world between the 1950s and 1980s: a growing collective anxiety about rising birth rates that culminated in the adoption of population control measures. This paper examines the "glocal" history of population-centered sex education in the developing world in the 1960s and 1970s, through the case study of Singapore. Examining the emergence of the first sex education curriculum in post-independence Singapore between 1966 and 1973, I argue that population-centered sex education that emerged in Singapore was intimately connected with global population politics. Analysis of how the policy was formulated shows that the Singapore state reacted to both domestic and global concerns. In connecting local developments to global contexts, this paper gestures toward the possibilities of studying the global history of population-centered sex education.