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<blockquote data-quote="Lonely Tylenol" data-source="post: 3303169" data-attributes="member: 18549">It's pretty much because men are degenerate women, genetically.&nbsp; Everyone has an X chromosome, and the default genetic state is female.&nbsp; But men have a Y chromosome as well, which pretty much just contains instructions on how to not be female.&nbsp; The genes encoding nipples are present in every human, and something on the Y chromosome precipitates hormonal states that suppress the development of female traits like mammary growth.&nbsp; This can be overcome by deliberate hormone control regimens, such as the ones that TS people undergo.&nbsp; The reason why men have even vestigial nipples, as opposed to no nipples, is because there's not really anything to be gained from suppressing them more than they already are.As far as why there's only two nipples, every mammalian embryo has two of what are called &quot;milk lines&quot;, which are lines of special tissue that can develop into lactating cells.&nbsp; Since there's two of these, the number of nipples in a species tends to correspond to the average litter size, rounded to the next highest even number.&nbsp; Since humans have, on average, one offspring per pregnancy, they have two nipples.</blockquote>

[QUOTE="Lonely Tylenol, post: 3303169, member: 18549"] It's pretty much because men are degenerate women, genetically. Everyone has an X chromosome, and the default genetic state is female. But men have a Y chromosome as well, which pretty much just contains instructions on how to not be female. The genes encoding nipples are present in every human, and something on the Y chromosome precipitates hormonal states that suppress the development of female traits like mammary growth. This can be overcome by deliberate hormone control regimens, such as the ones that TS people undergo. The reason why men have even vestigial nipples, as opposed to no nipples, is because there's not really anything to be gained from suppressing them more than they already are. As far as why there's only two nipples, every mammalian embryo has two of what are called "milk lines", which are lines of special tissue that can develop into lactating cells. Since there's two of these, the number of nipples in a species tends to correspond to the average litter size, rounded to the next highest even number. Since humans have, on average, one offspring per pregnancy, they have two nipples. [/QUOTE]

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