Says this article here.
Says that what some think of as the moral standard (two married parents with children in a stable unit) was a post-WW2 blip. "After 1945 marriage, at least once, became almost universal and most marriages produced children. Average age at marriage fell to historically low levels at the same time that life expectancy was rising and divorce remained difficult to obtain, so marriages tended to last longer. How contented they were is less certain: the rapid increase in divorce among these very couples after 1969, most initiated by women, along with the growing preference for unmarried cohabitation on the part of many of their children, may call in question the success of many of these marriages."
Lots of little interesting bits of historical info (well, I thought so, anyway).