Young people all over the world are keen to learn about sex and relationships but are not finding the information they seek in their immediate environment. The internet provides them with a welcome alternative. In response to the rapid increased connectivity of young people, international organisations that work on comprehensive sex education for young people have moved online. While there are new opportunities to reach young people in these digital spaces, sex educators also encounter restrictions. They face the immense power of new supranational commercial digital gatekeepers such as Facebook and Google and must respond to digitally mediated sexual and gender-based violence. This article introduces a special issue of the IDS Bulletin on experiences with internet‑based sex education in 14 countries. The authors explore how familiar forms of exclusion and inequality, as well as empathy and solidarity, manifest themselves in these new digital spaces in highly diverse national settings.