Anatomical development is well underway before sex determination in an embryo. And, according to evolutionary theory, the better question may be: Why not?
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Why do men have nipples? : hundreds of questions you'd only ask a
Why do men have nipples?
Leyner, Mark, Goldberg M.D., Billy: : Books
Why Do Men Have Nipples?: Hundreds of Questions You'd Only Ask a Doctor After Your Third Martini
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Excerpt from Why Do Men Fall Asleep After Sex?
I Had Nipple Reduction Surgery. I first noticed I had…
Why do men have nipples? Work by yourself to write down an answer
Why Do Men Have Nipples? Hundreds of Questions You'd Only Ask a
Why do men have nipples? - Imgur