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This difference in the relative amounts of these sex steroids is largely responsible for the physiological differences that distinguish men from women.During puberty, hormones which stimulate androgen production result in the development of secondary sexual characteristics, thus exhibiting greater differences between the sexes.The term secondary sexual characteristics denotes all other sexual distinctions that play indirect roles in uniting sperm and eggs.Secondary sexual characteristics include everything from the specialized male and female features of the genital tract, to the brilliant plumage of male birds or facial hair of humans, to behavioral features such as courtship.This is referred to as the XY sex-determination system and is typical of most mammals, but quite a few other sex-determination systems exist, including some that are non-genetic.The term primary sexual characteristics denotes the kind of gamete the gonad produces: the ovary produces egg cells in the female, and the testis produces sperm cells in the male.Another significant hormone in sexual differentiation is the Anti-müllerian hormone, which inhibits development of the Müllerian ducts.

*Manus in Indo-European mythology was the first man, see Mannus, Manu (Hinduism).In mammals, the hormones that influence sexual differentiation and development are androgens (mainly testosterone), which stimulate later development of the ovary.In the sexually undifferentiated embryo, testosterone stimulates the development of the Wolffian ducts, the penis, and closure of the labioscrotal folds into the scrotum.The male reproductive system's function is to produce semen which carries sperm and thus genetic information that can unite with an egg within a woman.Since sperm that enters a woman's uterus and then fallopian tubes goes on to fertilize an egg which develops into a fetus or child, the male reproductive system plays no necessary role during the gestation.

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