any other female of any animal species with breasts doesn’t really ‘develop’ them unless they’re pregnant so why do human women develop breasts at puberty, just for them to develop even more during pregnancy?
In: Biology
Sexual dimorphism. The sexes being different from each other. It’s to help members of the species identify who to have sex with. They exist to look sexy.
When species don’t have anything else to compete with externally; they’re fed and safe, they start competing with each other to decide who gets to mate. Some birds and spiders dance, some build fancy nests, “mating rituals”. Typically it’s hard things to do that sickly members of the species fail at. In humans, it’s fat. Breast tissue is fatty material and excess calories were hard to come by for a long time. Fat people are wealthy when food is scarce.
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