Well, I've done some superficial searching and I can't find any mention of "women saying no" being a cause of our large brain sizes. I've seen plenty of possible explanations, but not this one. I don't see how it's any more significant in (pre) humans than other animals, nor how this would be any kind of cause of big brains. If anyone has any knowledge about this, I'd be interested to know!
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Quickstart guide to the forum