Another way to manage common ownership of real estate is to use a joint sales contract for individual items if you buy them. See our model agreement below. Cohabitation agreements can contribute to a smoother separation. It can also save you money. Litigation can be expensive and a legal document that sets out your mutual decisions can be of great help. What happens to a concubine contract as soon as a couple marries depends on the structure of the concubine contract. It is a good idea that the parties, after entering into a cohabitation contract and then getting married, get a pre-marital agreement, because if two people marry, marriage leads to certain legal rights in each of these parties that did not exist when they simply cohabit. .