Because they all vary, wildly.
The elephant in the room: height, Height varies extremely between people even more so than dick or bust sizes.
Take a look at body proportion, some people are just bigger bottomed or thicker thighs, this is because each body store fat slightly different than the other, not by much, but still noticeable. I mean, we all have different feet sizes ffs.
Even basic things like moustache and beards, some people just can’t grow beards due to lack of follicles.
The reason why Penis and Breast sizes seems to be so wildely different is because how much emphasis we place on it.
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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