It is unfortunate, but lets not forget that we do live in a culture that allows women sexual freedom, regardless of the fact that it's human nature; it only shows that while human nature can't be rubbed out, it can tolerate things that go against it's grain.
It's only since the invention of the pill that women (and men) have been able to explore and discover female sexuality unhindered by the consequence of pregnancy, risky birth and prolonged parental investments ? the first two something men don?t ever have to consider. What has become clear in the last 50 or so years is that women do enjoy sex, something the Victorians would perhaps be surprised by ? and if you think about it, if, every time you had sex, you had to worry about whether you would get pregnant or not, if you did to bring up that infant, suckling it for perhaps 5 years (all that time your sex drive being suppressed by hormones)- this all with more kids in the background sapping your energy so that even if your husband was the best lover on the world, you just needed to sleep - then after suckling ended and your menses returned, thinking the next time you had sex, it might start the whole cycle again (one you could expect to go through many times, especially if you enjoyed sex, you kind of start to understand where this myth of women not enjoying sex might have came from.
But back to the point, given half a chance, women like sex; and being freed for the first time in human history from the cycle above (ironically especially suffered by the ones who liked sex more than average, though rape was endemic within marriage anyway, another reason to develop a dislike of intercourse), but we cannot be divorced from our evolutionary heritage, which evolved, actually building and shaping our bodies and brains to deal with these and more challenges and dilemmas.
Our genes know more than we do, and instruct us (we are not slaves to this, as it evident all around us) to think before we jump into bed with just anyone; what if the condom were to break, or some chemical compound we have recently ingested were to interfere with the pill? Our human nature and specific female (not male, who has different whispers when it comes to sex) sexuality is the sensible voice on our shoulder, telling us of the possible consequences when we want to be reckless. We can go ahead and be reckless, many of us today are and trust in the freedom medical science has given us. But we are an anomaly, billions or women around the world don?t have these privileges and they depend on that voice, their lives and the lives of their current children depend on it, from it telling them that they just cannot support another mouth to feed or that if they are alone and come across a man in the bush they should run, or better still, go around in groups to lessen the risk of rape. We are no different from these women, we just live in a culture that drowns out our primitive evolutionary consciousness with the din of consumerism and instant gratification ? with no apparent consequences. That voice is always there though, murmuring in the background, which is why women will always be more discriminating than men (on average) but today are less discriminating than our female ancestors ? and that voice will come back to the fore, should our circumstances change.