It is completely circular to argue that Marriage should be only between a man and a woman because marriage is between a man and a woman. First it is based upon a false assumptiuon as there is a strong historical and religious precedent for polygamy, so marriage between one man and one woman can not be considered a singular historical or religious norm. Second it assumes that things should stay the way they are because they have been that way for a long time which precludes any idea of progress ever being made.  Marriage describes an emotional relationship, it does not refer to the gender make-up of the couple. It is a commitment to love and care for your spouse till death does you part, an obligation that is no more difficult for a gay couple than a heterosexual couple. Furthermore, if gay couples wish to make such marital commitments to each other, 'why should they be prevented from doing so while other adults, equivalent in all other ways, are allowed to do so?1' It is clear discrimination to deny to one sub-set of the population the right to marry based purely on traditional and out-dated notions of what constitutes marriage.  1 The Economist. (2004, February 26). The case for gay marriage. Retrieved May 19, 2011, from The Economist