RE: Ask a biologist
May 23, 2015 at 8:29 pm
(This post was last modified: May 23, 2015 at 9:24 pm by nihilistcat.)
(May 23, 2015 at 7:43 pm)Brian37 Wrote: Why are there nipples on men?
It has to do with early development. Initially, the embryo follows a female developmental path (it doesn't express testosterone in the first two months of development), and by then it's too late (we're stuck with mammary papilla).