But genes don’t stop at masculine faces. They choreograph a woman’s preference for masculine gaits, bodies, odors, voices, and personalities.29 Women in the low fertility phase feel more commitment to their partner, but during the high fertility phase they are more prone to cheat, to fantasize about cheating, to dress attractively, and to meet and flirt with new men.30 If, however, a woman’s partner is attractive, or if his MHC genes, which code for the immune system, complement hers and incline their children toward immune health, then her wandering eye is less pronounced—again a clever
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