Societies of abrahamic religious background are known to have (had) very rigid standards on sexual morality. And as many of you know, Catholicism is at least in theory the most rigid. True, 99 whips for fornication in Islam are still more than just slightly rigid, but Islam has never had a problem with contraception per se, much in contrasts to Catholicism. Once in a while, I also saw a chart covering the no-nos and permissions regarding sexuality in various branches of religions. While possibly selective in showing Catholic prohibitions first, most other religions seemed to be at least more permissable in various, though not all circumstances, than Catholizism.
Curiously, it's been the West to (mostly) shake off the Abrahamic baggage of sexuality rigidity.
So how do we get history to have at least central parts of the Islamic World develop a 20th-century-OTLesque sexual revolution first and having the Occident struggling with adopting "near eastern decadency" at the same time?