Conta Natura

The researchers photographed 59 women between 18 and 25, who were wearing no makeup, and took a urine sample from each subject for hormone analysis. A group of men then rated the women in the photographs for health, femininity and attractiveness.

The results showed that men were most attracted to the women who tested for high levels of estrogen. Miriam Law Smith, who helped carry out the research, says men were, in effect, choosing the women best poised to bear children.

"From an evolutionary point of view, it would now make sense that men prefer feminine female faces because those are the women who have higher estrogen levels, and who are ultimately more fertile," says Law Smith. "In our evolutionary past, men who favoured women with feminine features would be choosing the more fertile female, thus would have had more babies and be passing on more of their genes."

CHRISTOPHER HUTSUL

Artigos originais relacionados com este assunto*:

Women's attractiveness judgments of self-resembling faces change across the menstrual cycle.

DeBruine LM, Jones BC, Perrett DI.

Two lines of reasoning predict that women's preferences for people exhibiting cues to kinship will be lower in the follicular phase than in the luteal phase of the menstrual cycle. Women may avoid kinship cues during the follicular phase when they are most fertile due to the costs of inbreeding. Alternatively, women may seek kinship cues during the luteal phase as a byproduct of the benefits of associating with kin during pregnancy, which is also characterized by high progesterone. We find that preferences for facial resemblance, a putative kinship cue, follow this predicted pattern and are positively correlated with estimated progesterone levels based on cycle day. Neither estimated estrogen levels nor conception risk predicted preferences for self-resemblance, and the cyclic shift was stronger for preferences for female faces than male faces. These findings lead to the possibility that this cyclic change in preference for self-resemblance may be a byproduct of a hormonal mechanism for increasing affiliative behavior toward kin during pregnancy rather than a mechanism for preventing inbreeding during fertile periods.

Horm Behav. 2005 Apr;47(4):379-83. Epub 2005 Jan 25.

Female intrasexual competition decreases female facial attractiveness.

Fisher ML.

Evolutionary theory predicts that female intrasexual competition will occur when males of high genetic quality are considered to be a resource. It is probable that women compete in terms of attractiveness since this is one of the primary criteria used by men when selecting mates. Furthermore, because hormones influence the mate-selection process, they may also mediate competition. One competitive strategy that women use is derogation--any act intended to decrease a rival's perceived value. To investigate intrasexual competition through derogation, the influence of oestrogen on women's ratings of female facial attractiveness was examined. During periods of high oestrogen, competition, and hence derogation, increased, as evidenced by lower ratings of female facial attractiveness. By contrast, oestrogen levels did not significantly affect ratings of male faces. These findings support the theory of female intrasexual competition with respect to attractiveness.

Proc Biol Sci. 2004 Aug 7;271 Suppl 5:S283-5.

*ainda estou à procura do artigo original desta notícia.