Human's worldwide almost always lean this way when kissing.

July 19, 2017
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Sucking face, making out, however you say it, kissing is one of the fun things we get to do in life. Now a new study finds kissing, much like laughter, is pretty much the same in every country. Published in the Scientific Reports, researchers had 48 married couples kiss both at home and in priviate and then report on the kissing in writing. The data shows that most people turn their heads to the right while kissing, and men are 15 times more likely than women to initiate kissing. The findings suggest that your dominant hand may predict head-leaning preference in kiss initiators but not in kiss recipients, and that the kiss initiator's head-leaning direction predicts the recipients head-leaning direction. 

Source: UPI