Men really perceive everything more sharply - it's not from debilitating and not from inefficiency. The female body, the wicked mother-nature, did not die from a painful shock at birth (and did not digest during pregnancy), and the male body under the perception and speed of reaction, which enable it to protect itself from danger. Accordingly, the nervous system either buys endurance by forced retardation, or activity and activity - at the cost of a more acute reaction to stimuli even to harm itself.