The concept of sexual selection has been around since Darwin, but the notion of parasites being a major driver of sexual selection in their hosts is relatively recent. Sparked by the inception of the Hamilton–Zuk hypothesis four decades ago, parasite-mediated sexual selection (PMSS) has since been a major focus of both theoretical and empirical research in evolutionary biology. This chapter discusses the development and current state of PMSS research, from the main hypotheses (good genes, transmission avoidance, parental care), to empirical data and mathematical modeling. It pays special attention to sexually transmitted infections (STIs) and considers the implications of host–parasite coevolution for PMSS, including recent theoretical advancements in this area. Finally, the chapter identifies directions for future theoretical and empirical research into PMSS.
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