For most young people in the world, sex and relationships have a big impact on their lives. However, various gatekeepers restrict reliable information on sexual health that has a positive take on pleasure and relationships. Therefore, online sex education is of vital importance for young people. Using online traffic data and information on operational realities from Love Matters – an online provider of sex education on web, mobile and social media platforms in China, Egypt, Kenya, Mexico and India – this article attempts to contribute to an understanding of how online information about sexual health education in different national contexts is accessed by users and restricted by gatekeepers. Our findings show the importance of understanding audiences, visible traditional and invisible online gatekeepers, and working with local and supranational commercial organisations for effective outreach and provision of sex education.