Parasite-mediated sexual selection is still a widely discussed hypothesis for the understanding of the evolution of secondary sex traits. Furthermore, it has sparked new fields such as ecological immunology. Despite this, most tests have been restricted to the manipulation of parasite loads. Here, we provide a new experimental approach, where resistance itself was manipulated. Parasitoid-resistant Drosophila melanogaster males achieved a higher mating success compared with non-resistant conspecifics. The underlying mechanism however remains elusive. Reproduction; Reproductive behaviour; Evolution; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Immunology and repair mechanisms Drosophila melanogaster (Drosophilidae); Mating; Male mating success; Natural selection; Sexual selection; Hymenopteran parasites; Asobara tabida; Host mating success related to selection for parasite resistance; Immune like reactions; Immunocompetence Asobara tabida (Braconidae); Dipteran hosts; Drosophila melanogaster; Host mating success related to selection for parasite resistance none