Having a roommate does not in and of itself equal "co-habitation".  Co-habitation has been loosely defined as not necessarily holding oneself out to be Husband and Wife, but is more than a simple roommate or "boarding arrangement."  There must be a showing of a sexual, romantic or at least a "homemaker-companion" relationship.The philosophy underlying the co-habitation statute is that parties who share a household and have a relationship should not benefit by continuing to receive spousal support without some consideration being given to the reduced financial need that results from this sharing.  A finding of co-habitation allows for a rebuttable presumption of a decreased need for spousal support.  However, simply having a roommate can have the same effect (i.e. support a finding sufficient to modify spousal support), since a roommate's contributions to living expenses (rent) is income.