Loyalty agreement is not strictly legal terms, but in the news media in large quantities. Most people recognized the meaning is this: love, marriage party or a written or oral agreement reached by both sides, the party needs to appear disloyal behavior bear the relevant compensation. Foreign spouses family composition is mainly horizontal ties, domestic Sons centered mainly longitudinal ties. Couples double for family responsibilities seem to maintain long-term relationships, in fact, did not reach the West is so highly of bilateral relations maintained. In such a contract theory dominant in the context of a prenuptial agreement is necessary. Continued growth in today's domestic divorce, mistresses, extramarital affairs and other marital problems have become negative talk of gossip. Changes in the economic base also contributed to changes in the social structure, people pay more attention to the relationship between husband and wife laterally.