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abortion Alexander Marshack Amahuaca amygdala animals appears assertion attitudes become biological birthrates body brain breastfeeding Bushmen cave cerebellum cerebral cortex changes child circumstances commitment communities complex concerned connection consequences context contraceptive contrade cultural depression diets discussion Dordogne drugs economic effect Ethology evolution example existence experience females function future genetic human human evolution hunter-gatherers hunting hunting-gathering ical ideas implications important increase individual involved kibbutz Lascaux least less lives males married matter means ment moral mother nature nomic notion one's opiates optimism optimistic organization overall Palio parents particular pattern percent perhaps physiological pill placebo effect placebos political population possible presumably primates problem produce Psychiatry psychological question reason relationship relatively religious reproductive response rhesus monkeys sense sexual skill society species stimulate substances suggests suicide symbols tion understanding women