I think you may be overstating the degree to which the sexual revolution has been rolled back. Its two pillars were universal birth control and sex outside of marriage--in other words the decoupling of sex from family and procreation--and those are very much still in place. MeToo isn't a rollback of those changes. Maybe there is a Puritan element to it, but there has always been a displaced Puritanism among certain elements of the left.