Why do men have nipples?
They are evidence of our developmental clock. In the early stages of life from conception until about 14 weeks, all human foetuses look the same, regardless of gender. At the tender age of 14 weeks post-fertilization , genetically-male foetuses begin to produce male hormones including testosterone. By 14 weeks, when the hormones turn on, the nipples have already formed. So, while our male foetus goes on to become a baby boy.