Why Do We Kiss?
The average person will spend about 20,160 minutes of his/her life kissing.
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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. (1:47)
Research suggests that the white scleras in human eyes make it easier for us to ascertain the direction of someone else's gaze. (4:51)
The polarity principle states that stress, including the stress of uncertainty, is an ingredient in attachment or love. (10:20)