Gender Differences
Men's arms rotate slightly inwards while women's arms rotate slightly outwards. These rotation differences have enabled men to aim and throw more accurately, while women's splayed elbows give them a wider, more stable position for carrying babies. One interesting difference is that women tend to keep their arms more open when they are around men they find attractive and are likely to fold their arms across their breasts around aggressive or unattractive men.
Arm Signals
Inward rotating arms allow men to throw accurately; women's outward rotating arms make for better carrying
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