A prenup is an agreement that both parties sign before a marriage. A concubine`s contract may contain the same clauses or provisions as a prenup and become a contract after the marriage or engagement. However, unlike the other two, a relationship agreement is not legally binding and is therefore not applicable. Although it is similar to a marriage contract, a concubine`s contract form is not the same as a marriage contract. A marriage is only used if two people are considering a marriage. Indeed, many states have laws that do not respect a marriage contract if the couple decides not to marry. While a simple concubine agreement may be enough to protect your interests, anyone could benefit from professional support. A lawyer can help design an agreement that complies with local laws and meets potential commitments related to cohabitation. Talk to an experienced family law lawyer before signing. If you come from a traditional family, you would undoubtedly be surprised to learn that people today prefer cohabitation to marriage. Apart from the fact that it is more convenient, it is much easier to cancel a concubine contract compared to a marriage contract.