basically like. why do women just have breasts all the time when to my knowledge the only purpose of them is to feed children. why don’t they go away like other mammals’ when you haven’t had a child.
In: Biology
No one is *really* sure. It’s like a lot of evolution… we aren’t a result of someone sitting down to design every single feature intentionally, for specific reasons.
Plenty of who we are have good reasons of course! And most of those reasons are pretty obvious. The opposable thumb is SUPER useful, so you can see why that evolved.
Breasts are one of those grey areas. The main theory is that it’s just visually sexually appealing. Either on their own, the way birds slowly get more elaborate feathers that serve no purpose other than attracting a mate, or to somehow replace various visual cues that are now hidden because we walk upright, and certain other areas are less prominent.
As you say – just about all mammals have breasts in some form, but humans are the only ones that keep them around other times beyond just the time needed to feed children.
Who knows for sure though? Maybe it’s some fluky side effect we don’t even know about! Maybe breasts were even *more* prone to breast cancer before they were permanent. Perhaps the growth and fading of breasts over many cycles of having kids made cancer much more common, and a fluky mutation to keep breasts around at all times actually resulted in a much lower incidence of cancer!
(I don’t think that’s *really* the case of course, but just pointing out that there is certainly the possibility that permanent breasts are almost a side effect of something else we aren’t aware of.)
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