In India, cohabitation had been taboo since British rule. However, this is no longer true in big cities, but is still often found in rural areas with more conservative values. Female live-in partners have economic rights under Protection of Women from Domestic Violence Act 2005.
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Look marriage is a legal alliance , liveins is not. most livein people finally marry for this reason, there is no guarantee and no one can help you if your fiance cheats, you dont get rights. Even abroad you dont get rights as you are not husnband and wife.