Jenny Uebbing makes a very good argument, but said very nicely said about why gay marriages aren't marriage. They are relationships. They are not the kind of marriage God invented to provide a home for children, and for the natural bonding between a male and female of a species. It doesn't matter whether you are able to conceive or not, it's the natural law of male and female completing an act that is not natural to homosexual couples.
Why marriage can never be gay
We have to stop tip toeing around and worrying about hurting people's feelings and realize this: Just because you think this lifestyle or that or this amount of money, drugs, sex, makes you happy is not what life is about. Life is living the way God made you, trying to make the best of it and be happy despite your limitations whatever they may be in your life.