but a higher level of oxytocin in a mother's body is directly related to the survival chance of the mother's immediate offspring -- this is not a _casual_ relationship, correct?

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EDIT 1: sorry if my comment makes you feel repugnant...my original intention is just to state what I think as fact per the issue in question...

EDIT 2: my mistake...the hormone related to care-giving behavior is oxytocin and not progesterone...but still, woman usually has higher level of oxytocin than man...