re: Why do feminine people cover their mouth when they laugh or get startled?

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Why do sports fans put their hands with interlocked fingers on top of their heads when their team fricks up? 

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From the Biblical act of heaping ashes upon one's head to signify calamity.

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There is a study showing "soy smile" had links to lower testosterone. Guys with smaller smiles have more test.

In primate culture opening your mouth real wide is a sign of submission. Probably has a similar back ground as this.

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Whats the whole "soy" thing being mentioned a lot? What does soy replace in a diet that can push feminine behaviors?

I have a half smile most of the time. Big family joke in pictures. I apparently have "beautiful" teeth, nvr had braces either. To the point my childhood (early elementary school) best friends mom would always force me to open my mouth, so she can see them whenever I came over. I always figured I hid my teeth in smiles to not draw attention.