There is seriously a fundamental misunderstanding about what marriage is. It is not about love, it is not about lust. To put it simply it is about the proliferation of the species.
Historically, I cannot think of any Western culture who instituted gay marriage. Sure, there were many who have been accepting of homosexuality, such as the ancient Greeks (and not all of them for that fact, such as the Spartans). For many centuries, love was not even a precept of marriage, it was a union between a man and a woman and their families for the purpose of producing heirs. Why do you think married couples get tax incentives? To make it easier on them financially to have and raise children. Of course, now-a-days we prefer to love the person we marry, I would prefer it myself.
So many people are clamoring for gay marriage, and apparently no one has any idea what marriage is meant for. If we go to change thousands upon thousands of years of cultural and legal precedence on a whim, a political fad that has only risen in popularity in the last couple of years, where will it end? What is even the point of being married if it is no longer about having children? Just to have the state recognize that you are in love? I'm sure I'll get a lot of red thumbs for this, but someone has to stand up and speak the damn truth every once in a while because the truth has clearly not dawned on any of you.