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Womens hypothalami are activated when they smell the chemical similar to testosterone but not to the estrogen-like substance, whereas mens hypothalami have the opposite response: They are turned on only by the estrogen-like chemical and not the testosterone-like one.
There is also sexual disparity between the specific sub-regions of hypothalamus that are activated.
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Pheromones are airborne chemical messengers released from the body (through, for example, sweat and urine) that have a physical or emotional effect on another member of the same species.