Adiposity, compared with masculinity, serves as a more valid cue to immunocompetence in human mate choice.

Rantala MJ, Coetzee V, Moore FR, Skrinda I, Kecko S, Krama T, Kivleniece I, Krams I.

Source

Department of Biology, Section of Ecology, University of Turku, , 20014 Turku, Finland, Department of Genetics, University of Pretoria, , Hatfield, 0028 Pretoria, South Africa, School of Psychology, University of Dundee, , Dundee DD1 4HN, UK, Institute of Systematic Biology, University of Daugavpils, , 540 Daugavpils, Latvia, Institute of Ecology and Earth Sciences, University of Tartu, , 51014 Tartu, Estonia.

Abstract

According to the 'good genes' hypothesis, females choose males based on traits that indicate the male's genetic quality in terms of disease resistance. The 'immunocompetence handicap hypothesis' proposed that secondary sexual traits serve as indicators of male genetic quality, because they indicate that males can contend with the immunosuppressive effects of testosterone. Masculinity is commonly assumed to serve as such a secondary sexual trait. Yet, women do not consistently prefer masculine looking men, nor is masculinity consistently related to health across studies. Here, we show that adiposity, but not masculinity, significantly mediates the relationship between a direct measure of immune response (hepatitis B antibody response) and attractiveness for both body and facial measurements. In addition, we show that circulating testosterone is more closely associated with adiposity than masculinity. These findings indicate that adiposity, compared with masculinity, serves as a more important cue to immunocompetence in female mate choice.