Please Help me

Scott Stanley (PREP, Inc.), more births occur to unmarried women (than married women) between the ages of 18 and 24; marriage is seen as “nice,” but with few differences compared to cohabitation; women’s attitudes toward marriage have been consistently decreasing since 1976; women are asking if they are going to have a fuller, happier life as a married person rather than “shacking-up.” What are your hypotheses regarding the presence of these attitudes? Why do these negative trends exist?