Its kind of a cultural thing. Relax, we're not out to kill you with static electricity.
Back in olden days, men did all the manual labor, women stayed in the house and did their work there. Women were expected to be servile and be second to men. This meant showing how submissive they are by shuffling their feet. Only strong and proud men took great strides. This just jumped into the peoples unconsciousness. Now people just do it out of habit.
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