My common friends wants to stay in a live in relationship.Is it legal?
Yes it is very much legal in India now after the Supreme Court Judgement.Moreover,
1) Children born out of live-in relationships are eligible to be maintained by both the parents and can succeed in inheritance of property of the parents.
2) Domestic Violence Act also includes live-in relationships.
3) Indian courts also tend to look at long term live-in relationships more or less like marriages with application of maintenance laws. The court has held that there is a presumption of marriage between those who are in live-in relationship for a long time and this cannot be termed as 'walking-in and walking-out' relationship. One night stands and spending weekends have been excluded from the scope.
Live in relationships are legal. No law can / will ever force two people to enter into a legal relationship (marriage) to live with another.