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
There’s a lot of theories, not a lot of certainties. Lindybeige has a [pretty solid video](https://youtu.be/xcrxNBlqrbM?si=-9S0A1WyuC1deF5M) speculating on why it could’ve been possible for breasts to evolve in this way.
If I recall correctly, he argues that a couple relatively unique human traits (walking upright, persistence predation) allowed for the mutation of permanent breasts to happen at all, and a different mutation happened where attraction for breasts was flipped from finding them unattractive to attractive, which allowed for the permanent breast trait to be sexually selected for.
Many of the other arguments among these comments are referring to developments and reinforcements after the fact, but could just as easily be true; there’s many influences and it could be any combination of them
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