Cohabitation obligation means that both men and women have the obligation to live together with each other based on their spouse status, and the sexual life of husband and wife is an important part of cohabitation obligation. In addition, it also includes the obligation to cooperate with each other and the obligation to sleep and eat together. These two obligations require husband and wife to support each other's wishes and activities and take care of each other.

Family affairs, mutual support and help, when one spouse is in danger, the other spouse has the obligation to rescue and rescue. Cohabitation obligation is a legal obligation, which is the same and equal obligation for both husband and wife. Husband and wife shall not refuse to perform the obligation of cohabitation without justifiable reasons.

2. Duty of chastity and loyalty

The obligation of chastity and loyalty, also known as the exclusive obligation of spouse's sexual life, refers to the exclusive obligation of spouse's sexual life, requiring both spouses to bear the obligation of chastity and loyalty to each other and not to have sex outside marriage. The broad sense of chastity obligation also includes not abandoning the other party maliciously and not sacrificing or hurting the spouse for the benefit of a third party.

The interests of one party. It is the most essential requirement of marriage that husband and wife bear the obligation of chastity and loyalty to each other, and the stability of marriage depends largely on loyalty in sexual life. If sex life is not exclusive, it will not lose its positive role, but will expand its negative role.

3. Maintenance obligation

Article 1059 of the Civil Code stipulates that husband and wife have the obligation to support each other. When the other party fails to perform the maintenance obligation, the party in need of maintenance has the right to ask the other party to pay the maintenance fee.

Second, what responsibility should one party bear for having an extramarital affair?

1. What legal responsibilities should both parties bear besides moral legacy?

(1) Two people live together in the name of husband and wife, and the spouse is suspected of bigamy: if the wife files a criminal private prosecution, she shall bear criminal responsibility (fixed-term imprisonment of not more than two years or criminal detention), and she shall also be compensated for mental damages at the time of divorce. If the other party who lives together knows that the other party has a spouse and still lives together in the name of husband and wife, it is also suspected of bigamy.

(2) Although the two parties involved in extramarital affairs are not husband and wife, they have lived together for a long time and steadily, which leads to the divorce of one spouse. At the time of divorce, they should also compensate the wife for mental damages.

(3) If there is no such situation, it is just a general extramarital affair. If marriage leads to divorce, the property can be properly divided during divorce.

(4) In addition, if there is only a general extramarital affair, but there is no such situation, and there is no divorce due to extramarital affairs, it can only be condemned by public opinion and morality.