I think there is also another mechanism at work in why many modern societies seem at the same time oversexualized and prude: By raising and restricting sexual desire you end up with some very effective carrots and sticks to control behaviour: You can sell the promise of sexual fulfillment directly (porn), you can link it to completely unrelated products through advertising (scantily-clad women that advertise cars, mattresses or mortgage contracts). You can also use it as a stick by either presenting unrealistic beauty standards ("You look unattractive! What is wrong with you?! Buy product X to fix that!") or by declaring the very desire that was raised before as immoral and therefore shaming people into compliance.