where is the evolutionary push to select for more promiscuous women? unless promiscuous women start breeding a lot more than the rest of us then we aren't going to rapidly evolve in that direction as a species.
Actually, the science demonstrates that humans and other hominids are promiscuous in both sexes...however the nature of this promiscuity is that it is silent, or hidden from other partners. In what appear to be "monogamous" pairs the female will engage in extra-pair copulation both to conceive as well as to protect her offspring. If you observe the sexual habits of many hominids you see that a female will often have a male companion as her primary companion in a manner that appears to be monogamous, however she
will mate with other males
in her tribe, as well as with her "monogamous" mate when she
is not ovulating, which serves to reduce infanticide by competitive males since they will be unsure if the offspring she eventually has is theirs. When she
is ovulating guess what, it's not much better...now her desire to mate with a male other than her partner is greatest, and she will often leave the safety of her own group, and find a male in another tribe, and mate with him. This is female biology, it's not just the males that have an interest in extra-pair mating.
Studies on modern women further support the findings in nature. Researchers observe that as a woman nears ovulation, the type of male she is attracted to will shift away from the kinder, rounder faced, more fatherly type that she has at home and towards the sharp and prominent features of the large jawed, testosterone filled "stud." Her fantasies will tend to shift, her skirt will get shorter, her dance moves more provocative, her flirtation with other men will increase, her voice becomes sexier and higher pitched and her skin glows, and even her scent becomes subconsciously more attractive to male, and her desire to go out on the town will increase significantly...as will her desire to leave her boyfriend or husband at home.
These aspects of our biology are also observed in women after a few years of being paired with the same mate. Even the most desirable man becomes uninteresting after a few years, people find themselves in sexless marriages saying things like "I love him, but I just don't need sex anymore" though the man usually still desires his wife! It's sad, but it's not at all uncommon.
She complains about her "low libido" or her "hectic work schedule" or "raising the kids" but the fact is, her libido isn't dead, and if she WANTED sex, she'd have the time for it....she needs a new partner to rekindle her passion.
That is the biology....but so what, I'm a highly monogamous man, a romantic, more than any of the women I've ever been with (one called me "Too Disney." Though I have a very high drive, I'm not simply a beast driven by desire to breed to any available women, and of course women aren't either...we can choose our path. There are always individuals who will be different from what simple biology dictates - but to deny the reality of our biology, or to feel guilty for it is simply foolish. That ovulating women, in the short skirt at the club, who told her husband she was having a "girls night" might not act on her desires other than flirting, in fact, she may not even really be in touch with them (or willing to admit them to herself?), but chances are, she's got them...such is the life of a primate.