There is too much that could be said here, so I'll be brief.
Simply put, with the onset of the widespread use of chemical and other means of birth control, the language of procreation — of having children — was separated from the language of marriage. of Chicago ethicist Leon Kass argues in his chapter on courtship in , under the old system of courtship, marriage and bringing a child into the world were inextricably linked. With the ever decreasing risk of pregnancy, having sex and being married were no longer tied together.
Have you ever known a girl who went out with a guy who was a complete dolt but who could help her get ahead socially?
(And not to pick on women, it just as easily happens in reverse.) Those decisions are based more on economic theory of the 19th and 20th centuries than on any sort of biblical notion of desire for the opposite sex.
According to "France Today," French singles primarily spend time in groups as friends.