Well, being a Christian I have some very strong views in this but following the biblical injunction for a "man to leave his father and mother and cleave to his wife, and the two shall become one," speaks volumes.
I'm not going to go all religious on you all but the bible states-
'Then the Lord God made a woman from the rib he had taken out of the man, and he brought her to the man. The man said, "This is now bone of my bones and flesh of my flesh; she shall be called 'woman, ' for she was taken out of man." For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh so they are no longer two, but one. Therefore what God has joined together, let man not separate.'