The Three-Generation Bill Comes Due 

 J.D. Unwin predicted that loosening sexual restraint would cost a civilization its energy within three generations. We are inside the window.

I bring in three full passages from J.D. Unwin's Sex and Culture (1934) on how no civilization has displayed energy without absolute monogamy, how female emancipation movements appear with unfailing regularity at the end of cultural cycles, and how productive social energy depends on a generation inheriting restraint.