Ecological and social pressures drive same-sex sexual behaviour in non-human primates | Nature Ecology & Evolution

This research article from Nature Ecology & Evolution examines the occurrence of same-sex sexual behavior (SSB) in 59 non-human primate species, analyzing its associations with environmental, life history, and social traits. Findings indicate that SSB is more likely in species inhabiting drier environments with increased food scarcity and predation pressure, in species with greater size dimorphism and longer lifespans, and in those with more complex social structures and hierarchies. Structural equation modeling suggests that environmental and life history traits influence SSB indirectly, while social complexity directly promotes its occurrence.