We often regard a kiss as a way to show affection or to create a spark. An international survey of over 900 males and females aged 18-63 found that kissing serves a greater purpose and is more than a way to increase arousal. Instead, it’s an important way to assess a partner’s quality, especially for women and for those who rate themselves as highly attractive. Those who more easily separate sex from love (i.e., high sociosexuality) rated kissing as more important early in a relationship and experienced more change in attraction (less attraction toward a partner who was initially attractive post-kiss).
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Wlodarski, R. & Dunbar, R. I. M. (2013). Examining the possible functions of kissing in romantic relationships. Archives of Sexual Behavior. doi: 10.1007/s10508-013-0190-1