If you think that Live in relationship culture is brought from off shore than you might be not be completely aware of Indian culture. In Gujarat state there is a tribal region called Dang where Live in relationship is a common affair. Without getting married a couple can have children and can live for years together.
It might be surprising but the tradition is followed by community from ages, it not that they have adopted modern culture. The tradition is callen Naata Pratha. In the pratha the couple get engaged and start living together without wed lock. It is done so as they could not afford expanses of wedding so when they get financially stable they tie knot with band baja baraat. By that time they live together and can have children too which is legal in community.