This video discusses the evolution of sex differences, particularly highlighting evolutionary theory and new theories related to inborn sex differences. The video discusses the roles of men and women in society and how those differently distributed roles are associated with psychological characteristics. The video highlights that the types of work that men and women do in society are associated with its own type of psychology or psychological characteristics. Additionally, the kinds of work that men and women do in society are focused around notion of gender roles as there are varying expectations of men and women.