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Well you'll be glad to know everyone starts out as female with the respective gonads.
Men have breasts as well but it takes the combination of Oestrogen and Progesterone to develop these any further. That's why men can still get breast cancer. A fact that unfortunately only a few know.
Now if the body is unchecked the gonads will develop into a female form. It takes hih levels of testosterone to cause the development of the testicles instead. This also causes the sercretion of another hormone which prevents the formation of the uterus.
Theres lost of interesting cases around babies who are born with either both sex organs or with none. Also a few court cases as well....
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