> A woman is born with a vagina, uterus, fallopian tubes and breasts. A man is born with a penis, testicles, scrotum, prostate gland and adams apple. But note that the fetus doesn't have different gonads immediately. They start out without sex and at some point develop into the differentiated organs: > The chromosomal sex of the embryo is established at fertilization. However, 6 weeks elapse in humans before the first signs of sex differentiation are noticed. Sex differentiation involves a series of events whereby the sexually indifferent gonads and genitalia progressively acquire male or female characteristics.