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Its really quite simple. heterosexuality is a normal human biological condition. homosexuality is an abnormal human biological condition. Society does not want to punish people because of a genetic abnormality. Society should allow two gays of the same sex to make a legal binding commitment to each other. But such a union is not a marriage any more than a man and two women or a woman and her dog is a marriage.
Why do you keep bringing up other subjects when you can't defend your position?
Look, you guys are hung up about a word, "Marriage", because you think your Magic Sky Fairy gave you that word.
Reality is, Polygamous marriages were recognized in this country, and in societies to this very day. Now, you m ight not want to believe they are marriages, but they are.