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The laws vary from place to place, from time to time, and there are secular laws and religious laws, national laws and international agreements.  Depending on the arena  in which you are operating one can define things differently.  A case in point is that in two States it is legal for gay people to marry, in several States they can have civil unions, but in two thirds of the States there are constitutional bans on gay marriage--but some of those States allow civil unions and some do not.  Your question was black and white, but the answer cannot be.