Why do we flirt? Flirting is much more than just a bit of fun: it is a universal and essential aspect of human interaction. Anthropological research shows that flirting is to be found, in some form, in all cultures and societies around the world. Flirting is a basic instinct, part of human nature. This is not surprising: if we did not initiate contact and express interest in members of the opposite sex, we would not progress to reproduction, and the human species would become extinct. According to some evolutionary psychologists, flirting may even be the foundation of civilisation as we know it.