[via Mind Hacks] Human female orgasm and mate fluctuating asymmetry: Abstract of research by Randy Thornhill, Steven W. Gangestad, and Randall Comer. Human, Homo sapiens, female orgasm is not necessary for conception; hence it seems reasonable to hypothesize that orgasm is an adaptation for manipulating the outcome of sperm competition resulting from facultative polyandry.
Symmetry is Related to Sexual Dimorphism in Faces: Data Across Culture and Species: Research by Anthony C Little, et al. In humans, the face has been extensively studied in terms of attractiveness. Faces have the potential to be advertisements of mate quality and both symmetry and sexual dimorphism have been linked to the attractiveness of human face shape.
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