>>15 Nonsense, it's common knowledge in family sociology.
http://www.psychpage.com/family/mod_couples_thx/cdc.html
http://www.family.org/cforum/fosi/marriage/cohabitation/a0025248.cfm
http://www.divorcemag.com/news/cohabitation.shtml
however, this article provides an interesting rebuttal:
http://www.unmarried.org/cdc2002.html
But really, if you're going to move in together and commit to each other anyway, why not just get married? And if you're not ready to take that step and especially if you're having serious doubts, live apart.