A marriage is a legal contract, not a piece of paper promising fidelity. Fidelity has not mattered legally for a while now. Romantic pairing is a common enough

A marriage is a legal contract, not a piece of paper promising fidelity. Fidelity has not mattered legally for a while now. Romantic pairing is a common enough human thing that it makes sense to have legal constructs to protect both parties. If you are affording these protections to opposite-sex couples, then it is blatant discrimination not to do the same for same-sex couples. There is no rational basis for making such a restriction, after all. Legal marriage, as in a civil arrangement, isn't really a right. However, being treated equally under the law is a right. I am an atheist and yet I am married. I know other atheists who are married. Marriage can have religious aspects, but it doesn't have to.