by Anonymous on February 5th, 2005

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Why do males have nipples?

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  • by Neodarwinian49 on March 8th, 2011

    Neodarwinian49

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    The sex of the fetus is determined at about the 8th week with the control gene activation of the SRY region ( sex determining region ) on the Y chromosome. In a manner of speaking female is default sex in humans. At this 8th week point a testosterone surge occurs which begins development of testes. Also at this time the vaginal development is stopped. So, you have nipples on men and some men have even been known to lactate. This is invisible to natural selection as it is energetically favored ( would take energy to erase nipples ) and does not interfere with reproductive success. Evolutionary processes do not always have " points. "

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    • Evolutionary processes do not always have " points. "?

      Then why don't nipples in males shed off!!!

      And does not interfere with reproductive success?

      How is growth of mustache and beard energetically favored...

      Wises

      by Wises on March 9th, 2011

    • I told you why nipples do not " shed. " Why would it interfere with reproductive success? Women do not have any arbitrary sexually selective reason to shun them. They cost nothing to maintain and are default on the human body. Beards and mustaches are secondary sexual characteristics of males due to pubertal testosterone. They are really more of a byproduct and they are possible helpful in a sexually selective way. Perhaps the energetically favored concept I put forward was a bit much now that I think about it. Still, many things are invisible to natural selection, especially in humans.

      Neodarwinian49

      by Neodarwinian49 on March 9th, 2011

    • Dear Neodarwinian49,

      You wrote: "Perhaps the energetically favored concept I put forward was a bit much now that I think about it." That was refreshing to see but I think you might be too rough on yourself on this one. Your hypothesis makes sense to me when considering the amount of nutrients received by the fetus relative to it's mass compared to that of the grown-up body producing a mustache and beard. Besides, the hair has a function does it not?

      The question itself brings back a memory from long ago. I was taking a grad-level course in evolution at Ball State University years ago and I was an "older student" even back then. We were talking about vestigial organs and I asked about nipples in the male of our species. In almost the same breath with my question I expressed the fact that I felt some envy over my wife being able to breast feed our children when I could not. You would have thought that I had shouted heil Hitler in the classroom. Those kids looked at me as though I was the weirdest person they'd ever encountered in their short lives. LOL By the way, it was then that I learned from the professor that some men lactate.

      cloudman

      by cloudman on March 19th, 2011

    • My dream was graduate work in evolutionary biology. Too old now, but anyone should have the basics down. Unfortunately, in the US that is not common.

      Neodarwinian49

      by Neodarwinian49 on March 19th, 2011

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