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Hand holding involves a dominant and a submissive hand position. The dominant hand is the one over the top of the other hand, with the palm facing backward.
Women prefer the submissive postures in relationships. It is their subconscious preference, as it is men’s preference to assume the role of the dominant partner. Try it sometime with your girlfriend. Hold her hand in the reverse, where your palm faces forward like in the pic above. You will find your unconscious revolting against the act, a silent scream crying out from the cellar of your mind, begging for relief from the jarring oscillation to its rhythmic pulse.
William has subverted this natural predilection and holds Kate’s hand in the submissive posture. I predict she will cheat on him before her 38th birthday.