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Why Do We Kiss?
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Key Facts In This Video
Kissing may have begun as kiss-feeding, the exchange of pre-chewed food from one mouth to another. 01:47
Research suggests that the white scleras in human eyes make it easier for us to ascertain the direction of someone else's gaze. 04:51
The polarity principle states that stress, including the stress of uncertainty, is an ingredient in attachment or love. 10:20