Why do men have nipples?

Men have nipples because all embryos, regardless of their biological sex, start off with the same basic body plan. In the early stages of development, both male and female embryos have the potential to develop into either sex. It is not until around the seventh week of gestation that the presence or absence of the Y chromosome determines the development of male or female reproductive organs.

During this early stage, the nipples begin to form before the sex of the embryo is determined. By the time the Y chromosome triggers the development of male reproductive organs, the nipples have already formed and are a part of the body structure. Therefore, men have nipples simply because they develop before the sex differentiation process occurs.

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