Why does the size of penis and breasts vary so much compared to other parts of the body?
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Its about environmental influence on body development. Stunting, where you don’t have good enough nutrition as a child to grow to the full height your body was capable of, is similar. Hormone production is also very prone to environmental influence like stress and exposure to other chemicals. The impression that its just genitals, which develop with hormone changes in puberty, is due to us going to much greater efforts to protect early childhood development when a lot of the rest of body develops the most, and hormones just being more sensitive than other systems.
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