Neither of the quibbles you drew are what people usually class as protective or nurturing behavior? At least in the English-speaking world that’s later in a child’s life than birth.
replyI’d also note that the concern about feeding babies has been obsolete since the invention of formula.
Is it correlation or causation?
replyTestosterone also drops when you dont get enough sleep, which is a universal lifestyle change for parents.
I edited the post to add a little more detail for people that (it seems, based on bizarre moderation of widely accepted realities) thought "men can't give birth to or feed babies" wasn't specific enough.
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