National income inequality predicts cultural variation in mouth to mouth kissing

Resumen

Romantic mouth-to-mouth kissing is culturally widespread, although not a human universal, and may play a functional role in assessing partner health and maintaining long-term pair bonds. Use and appreciation of kissing may therefore vary according to whether the environment places a premium on good health and partner investment. Here, we test for cultural variation (13 countries from six continents) in these behaviours/attitudes according to national health (historical pathogen prevalence) and both absolute (GDP) and relative wealth (GINI). Our data reveal that kissing is valued more in established relationships than it is valued during courtship. Also, consistent with the pair bonding hypothesis of the function of romantic kissing, relative poverty (income inequality) predicts frequency of kissing across romantic relationships. When aggregated, the predicted relationship between income inequality and kissing frequency (r=.67, BCa 95%CI[.32,.89]) was over five times the size of the null correlations between income inequality and frequency of hugging/cuddling and sex. As social complexity requires monitoring resource competition among large groups and predicts kissing prevalence in remote societies, this gesture may be important in the maintenance of long-term pair bonds in specific environments.

Christopher D. Watkins

Profesor y Director del Human Relationships Laboratory

Profesor Titular y Director del Human Relationships Laboratory (División de Psicología, Abertay University, Dundee, Reino Unido).

Juan David Leongómez

Profesor Asociado

Mis intereses de investigación incluyen los procesos de selección de pareja y la comunicación vocal en humanos, con una aspiración hacia la comprensión de la musicalidad. También estoy interesado en bioacústica y psicoacústica, así como en estadística y programación en .