Okay. Let's say, there will never be anything like a homosexual marriage in the catholic church. I have no problem with that.
Maybe we really should start to differ between the christian definition of a (spiritual) bondage between a couple, and the plain legal (in front of state and law) form of a family.
In germany there are much advatages of a marriage (in front of the law) for the couple. Not only taxes, but in question of inheritance.
In Germany two forms of marriage are known: In front of the law and in front of the church.