Under stress or threat: "Men's bodies release the chemicals norepinephrine and cortisol, which prompt fight-or-flight behaviors. Women, too, experience faster pulses and elevated blood pressure, but their bodies, instead, produce two different chemicals: endorphins and oxytocin, which lead to 'tend-and-befriend' behaviors. Women become more affiliative and appear to be friendly. 'Fight or flight' is the 'normal' response...if you are a man, yet it is the standard to which women are held."
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