The STI & HIV 2021 World Congress will be held in Amsterdam from 14 to 17 July 2021. This biennial meeting dedicated to STI in its broadest sense is organized by the International Society for STD Research (ISSTDR) in collaboration with the International Union against STI World (IUSTI World). The 2021 theme is “Sexual diversity and the city." The mission is to address diversity, health and sexuality in the urban context. Why? Over 60% of