In a country like India, it is not a good practice like live-in relationship. Actually, these kind of relationships are the idea which crop up in the mind of mentally ill people. I ask them a question can they have live-in relationship with their son, daughter, mother, father etc. If these cannot be based on live-in relationships then how this can be reasonable to have live-in relationship with him/her. Actually, this is an illegal arrangment between the two to enjoy phisically and when their urges are fulfilled, they get separated. Relationship with opposite sex should not be merely for physical reasons, but it is a deep relationship of two souls which are made for each other and for the durability of this relationship TRUST is the main pillar on which the entire relationship is built. For example, if you establish live-in relationship with a girl who had already live-in relationship with another person and she separated from him after some time (when he fulfilled her physical urges from him) then how it is possible that she is trustworthy. Therefore, in my opinion, live-in relationships are not as per Hindustani culture and we should keep away from this type of system.