RE: why do men have nipples?
They are there to tweek - very sensual
Someone asked what that has to do with the topic. Well I think it's a very good reason to have them.
If you asked "how is it that men have nipples?" that's different. Then you can refer to all the bio-science. (serious stuff)
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RE: why do men have nipples?
The genetic code for nipples is not contained on the sex chromosomes, XY. So, being male or female does not affect whether you have them or not.
Being male or female will determine what hormones you produce after puberty, which is why girls grow breasts and boys don't. Mess with hormones and you can get men to grow breasts. Not recommending it, just saying it biologically happens.
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