I'm going to pull some quotes from a 2008 article by Michael Coren entitled, "Michael Coren on Canada's biggest mistake: Gay marriage." He makes a lot of interesting points in the article. A few people have responded to this question saying that government has no place in judging what constitutes marriage. Coren said, "The state, though, should have a duty to judge and to do so based on its own interests. The most significant of which is its continued existence, meaning that we have to produce children. As procreation is the likely, if not essential, result of marriage between a man and a woman, it is in the interests of the state to encourage marriage.
Of course lesbian couples can have an obliging friend assist them in having a baby, and gay men can adopt or have an obliging friend have one for them, but this is hardly the norm and hardly going to guarantee the longevity of a stable society. Just as significant, it smashes the fundamental concept of a child being produced through an act of love. The donation of bodily fluid by an anonymous person, or that obliging friend again, is an act not of love but of lust, indifference, profit or a mere, well, helping hand.
For the first time not only in Canadian but in world history we are purposefully creating and legitimizing families where there will be either no male or no female role model and parent. Anyone who speaks of uncles, aunts, communities and villages raising children has no real understanding of family life. Single-parent families exist and are sometimes excellent and, obviously, not every mother/father family is a success. But to consciously create unbalanced families where children can never enjoy the profound difference between man and woman, mother and father, is dangerous social engineering."
I agree with Dragoon1140. Marriage is between a man and a woman.