Now-a-days it is the trend among the people that they move in before marriage. Either love or attachment plays a vital role in it. But the main concept of men and women living together before marriage is considered as a sin in some religions, or most religions. But as the world is making progress so are the minds of people, changing according with the time. Now an individual before even engagement or marriage moves in and then tries to understand the other person. Sometimes, this is the reason and sometimes it is not depending on the thinking and mentality of people. But it can be a problem for women as well as for men. Now the basic problem is that what a person should do? Whether he should let the change happen, or he shouldn’t. A New Woman magazine study by Columbia University discovered that twenty six percent of women reviewed and a slight nineteen percent of men wed the individual with whom they were co-habiting. The mean cohabitant has several partners in a lifetime. Cohabitation involves “no public firm promise, no promise for the future, no authorized statement of love and blame. There is essentially a personal placement founded on an emotional bond. The ‘commitment’ of dwelling simultaneously is easily a month-to-month rental agreement. There is a statement in The Future Of Marriage by Jessie Bernard in which he stated, “One fundamental fact underlies the conception of marriage itself. Some kind of firm pledge should be involved. Merely fly-by-night, feel and go relationships do not specify.” According to him the people who get married with a condition of dying with each other possess a reasonably distinct level of firm pledge, thus a quite distinct grade of security, therefore a rather distinct grade of freedom, and as an outcome a rather different grade of joyfulness than those who wed with a condition in their mind that they will last together till their love last. These types of people habitually anticipate the instant when they or their partner gets up one sunrise and discovers the fine emotion that retains them afloat has disintegrated under them. Cohabitation is a dangerous trend that has recently been too readily accepted without much resistance or criticism from society Is cohabitation a sin or not depends on what one means by the word ‘moving in together’, in the Bible it is clearly stated that having a sexual relationship before marriage is a sin and in the Bible the word ‘fornication’ has been used to explain the forbidden deed of living together before marriage and how sexually immoral such an act is. In most of the religions practiced all over the world the concept of cohabitation is prohibited and is considered as a sin for which one cannot be forgiven. Many couples living together are happy internally but due to the guilt inside of committing a sin and the social not acceptance of their relationship disturb their bond a>