Sexual mimicry in hyenas. Girls at birth already have a wider pelvic outlet. Truth and consequences: Using the bogus pipeline to examine sex differences in self-reported sexuality. Behaviour 69— doi Similarly, while it is widely accepted that mating preferences are usually more highly developed in females than males and individual variation in attractiveness is commonly a more important cause of variation in fitness in males than in females [ 6], there is increasing evidence that the strength of female mating preferences varies between and within species  and that males, too, often show consistent mating preferences  that can lead to the evolution of conspicuous ornaments in females [ 336566].
From Wikipedia, the free encyclopedia. Dominance rank, copulatory behavior and differential reproduction. Graham Foskett, Treakle, Bumstead Men have nipples because they help men find water. Studies constraining possible attentional targets of visual sexual stimuli address the possibility that men and women differ in their cognitive processing strategy when presented visual sexual stimuli to produce observed differences in neural activation.
In some plural breeders, too, dominant females direct frequent aggression at subordinates which delays their development, disrupts their reproductive cycles and causes them to down-regulate their reproductive systems or abort litters . Children of divorce, effects of adult replacements on previous offspring in Argentinean owl monkeys.
Rand AL. Toward an information processing model of sexual arousal. The underlying cause of the sex differences in stimulus preference is unclear. Sexual swellings advertise female quality in wild baboons. Sex of experimenter and social norm effects on reports of sexual behavior in young men and women.
Infanticide and expulsion of females in a cooperative mammal.
Thus there is frequently a period of adolescent sterility lasting a year to 18 months after menarche, but it cannot be relied on in the individual case. In singular breeders, dominant females commonly evict subordinates from the group when they reach adolescence, approach adult size or attempt to breed [ 28 , ].
Field studies of polygynous species have shown that aggression among males is often frequent and can lead to sustained physical fights, lasting until the defeat of a rival, accompanied by severe, sometimes fatal, wounding [ 75 , 76 ].
Journal of Clinical Endocrinology and Metabolism. Thus the adaptation for childbearing is present from an early age.