Originally Posted by jekyl_hyde
I'm not saying that climax of the sexual activities had anything to do with the fall of all of those societies, but it is interesting looking at the timeframe of when sexuality reached its peak, and how soon the civilization fell.
Soon? Centuries after the fact for you is "soon"? Sparta had its sexual peak in the IV Century BC and only fell IV century AC. That's 700~800 between the events. It also took centuries for Rome and Ancient Egypt.
Also, you got it backwards for Japan. Meiji Japan was more liberal sexually than Edo's, and the same thing can be said about post-WW II and pre-WW II.