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The theoretical debate over the relative contributions of nature and nurture to sexual differentiation of behavior has increasingly moved towards an interactionist explanation requiring both influences. In practice, however, nature and nurture have often been seen as separable, influencing human clinical sex assignment decisions, sometimes with disastrous consequences. Effects of the social environment and gender expectations in human cultures are ubiquitous, overshadowing potential underlying biological contributions in favor of the more observable social influences. Recent work in nonhuman primates showing behavioral sex differences paralleling human sex differences, including toy preferences, suggests that less easily observed biological factors also influence behavioral sexual differentiation in both monkeys and humans.
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Sexual Differentiation of Behavior in Monkeys: Role of Prenatal Hormones

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Sexual Differentiation of Behavior in Monkeys: Role of Prenatal Hormones

All rights reserved. On December 11, scientists at the University of Lethbridge in Canada published a paper revealing what appear to be sex acts between young female Japanese macaques and sika deer. The wild monkeys were observed mounting the deer in Minoo, central Japan. Similar monkey-deer interactions on Yakushima Island were reported in January
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Missouri woman fights to keep 'emotional support' monkeys

By Alice Klein. Female monkeys spend more time staring at males with strong masculine facial features. Face structure often varies between male and female members of a species.
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