Update on the statistics on cohabitation. A study of 13 countries (including the US), reported in USA Today (6/9/08, 5D), shows clearly that cohabitation is increasing. In the US, for example, it increased from 5.1 percent of all couples (in 1995) to 7.6 percent (in 2005). In Denmark and Sweden, approximately one-fourth of all couples cohabitate. Not everyone seems to agree on why people are increasingly cohabitating but among the reasons given are economic, uncertainty over the relationship, and as an alternative to traditional marriage.