This article is concerned with science and sexuality, and the possibilities and pitfalls of using the former to change minds about the latter, taking as its main source of data a report released by the Academy of Science of South Africa in 2015, Diversity in Human Sexuality: implications for policy in Africa. I frame the report in terms of co-production – borrowed from science and technology studies – and a theory of publics – taken from literary criticism and queer theory. I first describe how science has played a role in recent queer politics before showing how the report intervenes by appealing to a particularly African public. Thereafter, I describe how the choosing agentive subject disappears in the report’s depiction of the legitimate sexual citizen. Such a framing of citizenship raises several possible problems, some of which I address in the final section. These are described as potential confounders inhibiting the success of the report, preventing effective co-production or the summoning of a public. The article’s goal is not to discredit the report; rather, in pointing out how the report might fall short of its goal, it is directed towards a more reflexive activism.