I'm glad you brought this up, Skye. I wanted to, but I wasn't sure it was appropriate. None of these links are as recent as I'd prefer, but they offer links to some literature on this topic.

http://members.aol.com/cohabiting/facts.htm (Cohabiting Facts, posted by Chuck Colson, 1995)

http://www.eurekalert.org/pub_releas...-ltb080403.php (briefly summarizes a 2003 study about “cohabitation and marital quality and stability”)

http://www.godandscience.org/doctrin...gether.html#01 (although this website clearly has a religious perspective, the link I’ve included here is simply for a bibliography of peer-reviewed research studies about cohabitation, divorce, marriage, etc.)