A live-in-relationship is neither a step to understand one's partner better nor a substitute for marriage. It is a convenience just like marriage. It is a relationship just like marriage. The only difference being the social acceptance and legal issue. Some people are not comfortable with the idea of marriage. But want relationship. Want to live with the person he/ she loves. So whats wrong? Those who advocate marriage definitely mean, remain virgin (for both boy and girl), get married and have sex for two years, then have children and after that just live together because you are marred and have a child? May I ask where is marriage? It is only the so-called sanctity of it that most of the married couples live with than the actual marriage. There is nothing western about this concept. It is about convenience