The attempts to reduce, deconstruct, and denounce the sacrament of Marriage have apparently been a focus of those in the historical profession of late. What I chuckled at while in grad school has now become the basis for graduate assistantships no doubt.
Michael Fragoso's article is very instructive. But to me the best response - and only one that will ever matter - to the question of what marriage should or should not be was given by Christ to the Pharisees pestering him about divorce laws.
 Now when Jesus had finished these sayings, he went away from Galilee and entered the region of Judea beyond the Jordan;
 and large crowds followed him, and he healed them there.
 And Pharisees came up to him and tested him by asking, "Is it lawful to divorce one's wife for any cause?"
 He answered, "Have you not read that he who made them from the beginning 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. What therefore God has joined together, let not man put asunder."
 They said to him, "Why then did Moses command one to give a certificate of divorce, and to put her away?"
 He said to them, "For your hardness of heart Moses allowed you to divorce your wives, but from the beginning it was not so.
This was where JP II launched from at the beginning of his Theology of the Body catechises (and then he bounces back to Genesis and all around Scripture on this same "from the beginning" theme).
Like Stan Lee always used to close with in the letters page of Marvel Comics: "Nuff said."