Gender essentialism is a concept used to examine the attribution of fixed, intrinsic, innate qualities to women and men. In this theory, there are certain universal, innate, biologically or psychologically based features of gender that are at the root of observed differences in the behavior of men and women. In Western civilization, it is suggested in writings going back to ancient Greece. With the advent of Christianity, the earlier Greek model was expressed in theological discussions as the doctrine that there are two distinct sexes, male and female created by God, and that individuals are immutably one or the other. This view remained essentially unchanged until the middle of the 19th century. This changed the locus of the origin of the essential differences, in Sandra Bem's words, "fro