Research conducted over the last fifteen years has placed in
question many of the traditional conclusions about the evolution of
human female sexuality. Women have not lost estrus, as earlier
researchers thought, but it is simply concealed, resulting in two
functionally distinct sexualities with markedly different ends in
each phase. At the fertile phase of the cycle, women prefer male
traits that may mark superior genetic quality, and at infertile
phases, they prefer men willing to invest resources in a mate.
Thus, women's peri-ovulatory sexuality functions to obtain a sire
of superior genetic quality, and is homologous with estrus in other
vertebrates. This model sheds light on male human sexuality as
well: men perceive and respond to women's estrus, including by
increased mate guarding. Men's response is limited, compared to
other vertebrate males, implying coevolutionary history of
selection on females to conceal estrus from men and selection on
men to detect it. Research indicates that women's concealed estrus
is an adaptation to copulate conditionally with men other than the
pair-bond partner. Women's sexual ornaments-the
estrogen-facilitated features of face and body-are honest signals
of individual quality pertaining to future reproductive value.
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