In this unit, we explore possible answers to questions such as: What constitutes physical and interpersonal attractiveness? How many types of love are there? Where are the main sources of
attraction? What difference does attractiveness make to people's lives? What triggers the start of romantic relationships? Why do people who once loved one another break up? Does evolution dictate the mating strategies that men and women adopt?
No single theory can fully answer such questions. Nonetheless, different theories can provide partial or likely answers.