"Sex differences" is the label used in describing variations between women and men. The term "sex" reflects the division of women and men into two groups on the basis of their unique biological features; the term "differences" derives from the tradition of differential psychology, in which distinct groups of people (defined by natural categories such as sex or constructed categories such as socioeconomic class) are compared in terms of an outcome.

Both terms have been criticized. To many people, references to sex differences imply a biological determinism that ignores the role of socialization and context. The more contemporary term "gender" directs attention to the social meanings assigned to the categories of male and female. With either term, however, it is not necessary to assume a particular causal factor for an observed pattern of variation. A problem with the term "differences" is that it suggests that dis...