The social structure of populations plays a key role in shaping variation in sexual
selection. In nature, sexual selection occurs in communities of interacting species;
however, heterospecifics are rarely included in characterizations of social structure.
Heterospecifics can influence the reproductive outcomes of intrasexual competition
by interfering with intraspecific sexual interactions (interspecific reproductive
interference [IRI]). We outline the need for studies of sexual selection to incorporate
heterospecifics as part of the social environment. We use simulations to show that
classic predictions for the effect of social structure on sexual selection are altered
by an interaction between social structure and IRI. This interaction has wide-ranging
implications for patterns of sexual conflict and kin-selected reproductive strategies
in socially structured populations. Our work bridges the gap between sexual selection
research on social structure and IRI, and highlights future directions to study sexual
selection in interacting communities.