“…Some cohabiting unions are long-term, stable, "marriage-like" relationships, while others are temporary or on and off and may be entered into for the sake of reduced housing costs or convenience rather than as a long-term commitment (Brown and Booth 1996;Bumpass and Lu 2000;Sassler 2004). Qualitative research has shown that couples often move in together gradually, without a clear start date, and may not have definite plans about the future of the relationship (e.g., Manning and Smock 2005).…”