An increasing number of shark species have been reported to show some site-specific reproductive philopatry in which males and/or females return to the same location for mating and/or parturition. These patterns have mainly been found in tropical species. Here we used acoustic telemetry to demonstrate that both sexes of Port-Jackson sharks, a temperate endemics of Australia, return to the exact same reef in Jervis Bay to mate and reproduce after foraging in Southern Australia over summer. We used this mating aggregation ground to investigate the social interactions between individuals using a telemetry approach combined with genetic analysis to improve our understanding of the mating strategies of this iconic species. Our results demonstrate that males and females have complex dyadic interactions which can persist over multiple years, despite undertaking long distance annual migrations to foraging grounds following mating. While there are high levels of relatedness at each breeding location, genetic relatedness did not drastically influence association patterns. These findings revealed that these mating grounds represent social arenas in which interactions are far more complex than previously expected. This preliminary results provide additional information on improving our understanding of evolution of reproduction and social behavior in elasmobranchs which has profound implications for conservation management.