Finally, when talking about evolved differences in behavior between males and females one cannot make statements like “when it comes to personality men and women belong to two different species” without noting the biological reality that we are, indeed, the same species. There are no consistent brain differences between the sexes [iii], there is incredible overlap in our physiological function [iv], we engage in sexual activity in more or less the same patterns [v], and we overlap extensively in most other behavior as well. There are some interesting re-occurring differences, particularly in patterns of aggression and certain physiological correlates of reproduction, muscle density, and body size. However, anthropological datasets show enormous complexity in how and why men and women behave the ways that they do [vi]. Studies in human biology and anthropology regularly demonstrate a dynamic flexibility and complex biocultural context for all human behavior, and this is especially true for gender.