In general, research has shown a higher divorce rate for those who cohabited before marriage. It may be that the reason is that these people didn't really want to commit and so their bond was never strong. However, as a family therapist, I would advise against cohabitation before marriage. It is much more important to get to know each other as friends, to enjoy pleasant times with each other and look forward to seeing each other each time you meet. Plunging into housekeeping removes the opportunity to really learn about each other before you make a commitment. If it's a good match, you will have decades to enjoy that 24/7 togetherness!