Another new study confirms that men and women are different--specifically, that cohabitation seems to be a bad bargain for women. At The Atlantic's website, sociologist Brad Wilcox has a summary of the report, produced for the RAND Corp. by Michael Pollard and Kathleen Harris, also sociologists. Here's the central finding:

Pollard and Harris found that the majority of cohabiting young men do not endorse the maximum indicator of relationship permanence: 52 percent of cohabiting men between ages 18 and 26 are not "almost certain" that their relationship is permanent. Moreover, a large minority (41 percent)...