A very common belief here is that most human behaviour is based on Paleolithic genes, and only trivial variations are cultural (memetic), coming from fresh genes, or from some other sources.
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If preference for large breasts was genetic, surely there might be a family somewhere with some mutation which would prefer small breasts. Do we have any evidence of that?
Maybe there are also different ideas of what is and isn’t a trivial variation.
Maybe there are also different ideas of what is and isn’t a trivial variation.