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Andrew Rogers wrote:
I believe that the human embryo's sexual parts develop late during the pregnancy and that the material is in place before the embryo decides what sex it is.
I'm pretty sure the embryo doesn't decide it's own sex ;-) That's decided at conception except for some reptiles and fish, and a few odd cases like that. But yes male nipples appear to be an evolutionary left over. If we evolved (and I think we did) then perhaps the question should be "how come" as "why" implies design. I'm sure Google has much more on the topic, and I suspect our Doctor has forgotten more on this than anyone could care to imagine from what I remember of my mate Colin's medical textbooks. "The Pony Fish's Glow" by George C Williams discusses other related questions, including the vital "how come the tubing from the testes is looped over the ureter" (This is the biological equivalent of my old dogs unerring ability to go the opposite side of a lamppost to me when he was walking on a lead - completely stupid, and "what use is sex". -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe.