We have heard married people are happier and it is the high point of love, then that is the fact? Today, we often see many couples who live together but not legally married, also known as "Cohabitation". Some people think it inappropriate by the tradition, but cohabitation has more advantage that you never know, Test out the relationship, reduce the rate of divorce after marriage, and save money before get married, these advantages make many couple leads to more successful marriage.