The times without birth control are not in the distant past, those times are actually with us on this planet. And to be possibly obsessed with sex isn't strongly related to making babies I think. And I do not think any society on Earth is obsessed with sex, rather with aggression, nationalism, Nazi religion, dumbness, greed to name but a few. And in the European countries the only sort of realm that is obsessed with sex is advertising. And after all there is still vasectomy ;), and that is reversible if you want. ;))