The hypersexing of the culture had to happen along with feminism. The reason for that is that sexuality is the core natural power base of female human beings -- by nature and by law, they control sex, and sex is one of the strongest drives in men. So in order to flip the balance of power in favor of the females, society had to be more sexualized -- in effect, what it is doing is taking that sexual power and making it more blatantly exercised by women than was previously the case. That allows more women to capitalize on their inherent sexual power for gain -- whether financial (as is the case here), genetic, personal or what have you. Having sexuality all over the place and in your face is definitely a kind of "girl power" that operates on a very basic, instinctual, biological level.
There are feminists who are against this on *principle*, but at the same time argue forcefully for female sexual license, and the removal of any social taboos about female sexual license. Well, when you remove societal stigmatization of female sexual license, what you will see is increased activity around areas where sexually licentious females can profit --> prostitution, stripping, porn. All of these have boomed in the last 30 years and show no signs of abatement. It's part and parcel of having "sexually liberated women", because if you remove the taboos about female sexual license, more women will choose to use that license for financial benefit, precisely because it is de-stigmatized.