"If Jesus were to testify up on Beacon Hill before our legislators about the meaning of marriage, I think he could use the very same words that he used in St. Matthew's Gospel. Listen to him with fresh ears: 'Have you not read that in the beginning God 'made them male and female,' and said, 'for this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh'? So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.'"

People like to say that Jesus would have allowed a lot of things, usually their favorite causes. It would be infinitely more helpful, however, if they actually looked at what he did say before claiming Him for their cause. For those that have adopted the Marcionic position that he has somehow "eliminated" the Law, a position oft advanced by the ECUSA even though he specifically reiterates this point by name, I'd like to quote again:

Mt:5:17:
17 ¶ Do not think that I am come to destroy the law, or the prophets. I am not come to destroy, but to fulfil. (DRV)

By the Law and the Prophets he is referring to, of course, two of the three divisions of the Tanakh. Those are kinda key to understanding that whole Gospel thing. Highly recommended reading.