when the human fetus is being formed, they all start out as the same sex. inevitably this is a "female"-like fetus, because it has nipples. however, while the actual female fetuses develop the inside parts to produce milk when pregnant, from said nipples, the male fetuses don't, and thus the nipples are left over from when we all were created as the superior sex, woman. :D
i swear to god. my mom has that book. it's called why do men have nipples. and it's just filled with a bunch of questions you would only ask your doctor after a few cocktails. and that's one of the questions (clearly, it's the title question) and that's the scientific answer in the book!
There seems to be a logical explanation about why women have nipples - for babies. But why do men's bodies retain what appears to be redundant body parts? The Darwinian natural selection process would seem to dictate that male nipples really should not be there. So what's the deal? Why do men have nipples?
The answer is that as embryos men and women have similar tissues and body parts. If anything the embryo follows a 'female template'. That is why nipples are present in both sexes. It is the effect of the genes, the Y chromosome and the hormone testosterone that brings about the changes and masculinises the embryo. Testosterone promotes the growth of the penis and testicles. Because nipples are there before this process begins the nipples stay!
Nipples and breast tissue have no function as such except for perhaps protecting the heart and lungs from injury.
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when the human fetus is being formed, they all start out as the same sex. inevitably this is a "female"-like fetus, because it has nipples. however, while the actual female fetuses develop the inside parts to produce milk when pregnant, from said nipples, the male fetuses don't, and thus the nipples are left over from when we all were created as the superior sex, woman. :D
i swear to god. my mom has that book. it's called why do men have nipples. and it's just filled with a bunch of questions you would only ask your doctor after a few cocktails. and that's one of the questions (clearly, it's the title question) and that's the scientific answer in the book!
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The answer is that as embryos men and women have similar tissues and body parts. If anything the embryo follows a 'female template'. That is why nipples are present in both sexes. It is the effect of the genes, the Y chromosome and the hormone testosterone that brings about the changes and masculinises the embryo. Testosterone promotes the growth of the penis and testicles. Because nipples are there before this process begins the nipples stay!
Nipples and breast tissue have no function as such except for perhaps protecting the heart and lungs from injury.
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the end.
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