Faces of men with high serum testosterone are less attractive for women during the fertility phase of the menstrual cycle

The attractiveness of the human face plays an essential role in mating as it may signal the genetic suitability of a mate. The controversial ovulatory shift hypothesis postulates that women in the fertile phase of the menstrual cycle would prefer faces of masculine men with high testosterone that signals good genes, whereas in the non-fertile phase they prefer traits signaling the willingness to provide parental care. To examine relationships between mens testosterone and womens preferences for mens faces on day 13 of the menstrual cycle, 19 young women rated the attractiveness of images of the natural faces of 77 young men. Using advanced Bayesian multilevel modeling we showed that the attractiveness of mens faces is significantly lower in men with a high concentration of serum total testosterone, even taking into account the concentration of serum estrogen in the raters. The average mens face composited from images of 39 faces rated above pool median attractiveness rate, was slightly narrower than the average face composited from 38 less attractive faces. Our results challenge the ovulatory shift hypothesis as faces of males with high circulating testosterone were rated as less attractive than faces of males with lower testosterone by women on the fertile phase of the cycle.