"Unity with God and His will: A vow, integral unity with His will."

Which I attempt to do.

"It's the vow that John wants to split. "

WRONG! There was NOTHING in any marriage vow I have ever seen that says "Sex must always be open to procreation. 

RD thinks that he speaks with the voice of God. This is further evidence of his fundamental arrogance.  And if he thinks that my wife and I were called on to give up our sexual relationship because of a cockamamie theory about procreation being the reason for sexual intercourse between married couples, he is not just arrogant, but stupid as well.

The CDF wrote the catechism. The CDF's words can be ignored, just like any other non-binding opinion can.