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hvorfor har menn brystvorter?


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Wiki: Nipples on male mammals

Starting at conception and lasting until about 14 weeks, all mammalian fetuses within the same species look the same, regardless of sex. After 14 weeks, genetically-male fetuses begin producing male hormones such as testosterone. As "female" is the "developmental default" for mammals, by 14 weeks the nipples have already formed. In recent studies, doctors have found female nipples to be erect in the fetal stage of mammals, as well as other forms of arousal.[citation needed]

 

Most of the time, males' nipples don't change much past this point. However, some males develop a condition known as gynecomastia, in which the fatty tissue around and under the nipple develops into something similar to a female breast. This may happen whenever the testosterone level drops because of medications.

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