If you want to destroy a society, just target its sexual norms and values. If you can subvert and pervert human sexuality you can effectively kill a culture. We are seeing this played out before our very eyes right now. The bitter fruit of the sexual revolution of the 60s is still being manifest, and it does not look pretty.
The sexual anarchists knew that they could fundamentally transform a culture by unleashing a no-holds-barred sexual revolution. And it has been every bit as momentous and far-reaching as the various communist revolutions of last century.