Just bored and looking at these threads...I've seen lots of people use these figures to support their opinion that there are tons of non-married, non-marriage minded, cohabiting couples in the US. Looking at the US Census statistics, however, almost all households are married couples, singles living alone, or single parents. something like 8% of couples are non-married and cohabiting (5% of households?), and my guess is that a good portion of those are headed towards marriage. It's also interesting to note that in cohabiting households, the percentage of women who hold title to the family house is _MUCH_ larger than married couples...that jives with my experience that wealthier, career minded women are much more likely to want to "test drive" a man through cohabitation, or not get married at all. Seems like when it's their turn to risk their wealth in marriage, they all of a sudden get cold feet.
It also points out how detrimental the fall of marriage can be. It's not that marriage is being replaced by non-married couples. It's being replaced by divorcees, lonely singles, and one-parent households. When viewed in that light, it's much easier to see why taking steps to stabilize marriage would help society.