Karl Grammer and Randy Thornhill has shown that facial symmetry is the main factor for ratings of female and male attractiveness (when controlled for averageness). In addition, bodily symmetry correlates with ratings of facial attractiveness (even when the body is not visible). Comparable results can be found for the rating of bodily attractiveness in correlation with breast asymmetry. Symmetrical breasts are more attractive than asymmetrical breasts. Moreover, breast asymmetry is the best negative predictor for lactative ability and even for reproductive success. Thus bodily and facial symmetry may be good predictors for ratings of attractiveness. Theories of Symmetry and Attractiveness: Pro. Parasite resistance should be a trait, which is valued in mate-selection. Thus symmetry may be an honest signal for mate quality. Symmetry as a mate-selection criterion has been shown in many species, from scorpion flies over birds to humans. Symmetrical persons of both sexes copulate earlier in life and have a higher frequency of copulations, and finally are able to select mates from a greater circle of associates. Biologist Andres Muller and Randy Thornhill " asymmetry can signal malnutrition, disease, or bad genes." The tow have found that asymmetrical animals, ranging from barn swallows to lions, have fewer offspring and shorter lives. Theories of Symmetry and Attractiveness: Contra. There are several objections against a theoretical connection between parasite resistance and bodily symmetry. Body odor and pheromones : body odor and male perception of attractiveness. Several investigations on human body odor revealed the relevance of olfactory communication in humans and it's implications for sexual behavior. Human body odor has been reported to influence female mate choice in order to find a partner that possesses fitting ...
