1、 If the household registration is not together, it is not the key factor to determine whether men and women are husband and wife. Marriage should be subject to the marriage certificate. If there is no marriage certificate, no matter what the relationship is, it is not a husband and wife in law. In law, cohabitation in the name of husband and wife without marriage certificate is called illegal cohabitation. If conditions permit, get the marriage certificate as soon as possible, otherwise, the illegal cohabitation relationship should be ended.
 2、 Illegal cohabitation means that both men and women live together in the name of husband and wife without going through marriage registration procedures, and the masses also believe it is a cohabitation behavior of husband and wife relationship.
 1. Cohabitation refers to the social relationship formed by the public cohabitation of husband and wife without marriage registration.
 2. Both men and women without spouses live together openly in the name of husband and wife without marriage registration, which is a typical cohabitation relationship.
 3. The person with spouse and the opposite sex outside marriage openly cohabit in the name of husband and wife, that is, bigamy cohabitation.
 4. In addition to the open cohabitation relationship, the public cohabitation life with others is called double cohabitation.