Why Men have Nipples?

Every fetus is a female in the uterus until receiving the “Y” chromosome. If the sperm has a Y chromosome, your baby will be a boy. If it has an X chromosome, the baby will be a girl. If it is a boy, in the further stages of fetal development, when the testosterone kicks in, the cells begin to change in the genitals, but the nipples remain. That's why men have nipples.