Matthew 19:5.
Millions of men over the age of forty suffer from this problem and still enjoy a wonderful marriage.
LOL! That's why Viagra is such a very unpopular drug - because impotent men are so happily married.
I am young (23) but still feel I could be happily married and never have sex over the course of my life.
Good luck finding a spouse who feels the same way.
If you are going adopt a doctrine you need to site scripture and not the Church.
Here's an interesting passage of Scripture in which Saint Paul tells us why he is writing the Scripture in the first place:
"I write so that you will know how one ought to conduct himself in the household of God, which is the Church of the living God, the pillar and ground of the truth."
Your attempt to set up the Scriptures and the Church as opposing forces is illogical. The Church is the human author of, the preserver of, the defender of and the interpreter of the Scriptures - and is guided in these tasks by the Holy Spirit.
But I guess what you are saying is an impotent man can live with his girlfriend as long as he wants because no sex can happen and thus there is no sinning involved.
Also there are many ways to have a sexually fulfilling relationship without vaginal intercourse.