| | MALE, FEMALE; THE EVOLUTION OF HUMAN SEX DIFFERENCES by DAVID C. GEARY |
 | | In fact, some level of interest in sex differences would be expected for nearly all individuals of any sexually reproducing species, given that one of the most fundamental goals of life--to reproduce--necessarily involves negotiating some type of relationship with at least one member of the opposite sex. |
 | | Following the discussion of the dynamics of female choice and male-male competition, the focus shifts to discussion of the mechanisms that influence the expression of the associated sex differences in brain, behavior, and cognition, that is, sex hormones. |
 | | Sex differences in human physical development follow the pattern found in species with relatively intense male-male competition (Tanner, 1990) and clearly support the position that male-male competition has been an important social dynamic during the course of human evolution. |
| human-nature.com /books/geary1.html (4370 words) |