ABSTRACT
Except for the sex chromosomes and gonads all bodily differences between men and women must be attributed to the actions of sex hormones. While the inherent tendency of the prenatal human organism is to develop along female lines, prenatal differentiation as a male depends on testicular hormones (Mullerian–inhibiting–hormone and testosterone and its derivates). The wider bony pelvis in girls in comparison with boys, is probably dependent on local effects of prenatal ovarian estrogen production. There is no known fundamental difference in sensitivity to the biological action of sex steroids on the basis of the genetic patterns of 46,XY and 46,XX.
