In the 1930s, British anthropologist J.D. Unwin studied 86 cultures that stretched across 5,000 years. He found, without exception, when they restricted sex to marriage, they thrived.
Strong families headed by faithful spouses made for bold, prosperous societies. But not one culture survived more than three generations after turning sexually permissive.
Noted Harvard sociologist Pitirim Sorokin found no culture surviving once it ceased to support marriage and monogamy. None.
"Cause and Effect: The Benefits of Traditional Marriage"