Men can't nurse babies, so why on Earth do they have nipples?
The answer has to do with how humans develop in the womb, said Ian Tattersall, a paleoanthropologist at the American Museum of Natural History in New York City.
During the first several weeks, male and female embryos follow the same blueprint, which includes the development of nipples. However, at about six to seven weeks of gestation, a gene on the Y chromosome induces changes that lead to the development of the testes, the organ that makes and stores sperm and produces testosterone, according to the book"Exploring the Biological Contributions to Human Health: Does Sex Matter?" .
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