July 2021 marks 40 years from the first reports of a 'strange disease' soon to be known as HIV/Aids. In this "very special edition" themed Sexual Diversity and the City, the STI & HIV 2021 World Congress is inviting people from all walks of life, with some being able to participate for free.

Listen to all the details in this conversation of STI's Social Media Editor Harrison Austin with Henry de Vries, Professor of skin infections at the University of Amsterdam and President of the Congress, and Mark Vermeulen, Executive Director of Aidsfonds – Soa Aids Nederland.

Sexually Transmitted Infections (https://sti.bmj.com/) is the official journal of the STI & HIV 2021 World Congress, held as a virtual event on 14-17 July. The mission is to address diversity, health, and sexuality in the urban context. This bi-annual meeting is organised by the International Society for STD Research (ISSTDR) in collaboration with the International Union against STI World (IUSTI World) and is dedicated to STI in its broadest sense.