Yes, I see how I gave the wrong idea. He meant that they would consider their marriage worthless after finding that one or both of them are sterile. Also, how can you tell your wife "I won't have sex with you anymore, since the tests showed there's no possibility of pregnancy"?
Back in school, my θεολόγος (theologian teacher? I don't know how it is translated) used to say that sex does not have a sole purpose of having kids, since were that the case, sterile people shouldn't be married in the first place.The fault with this idea is you would not know they were sterile until they married.
Traditionally, at least in the Latin Church, sterility was an impediment to marriage.
The point of not having sex if you are sterile since there is no chance of conception is not the same as actively blocking conception. A sterile couple are not taking active, artificial means for blocking conception.
This is admittedly my biggest hurdle in possibly converting to Orthodoxy. I am convinced that artificial birth control is always sinful, to one degree or another. The constant tradition of the Church seems to favor this view as well. It is more in keeping with the hedonistic ethos of the the World to actively prevent preganancy by artifial means. It prevents the natural end of the marital union as intended by God.
Doctrinal controveries aside, the Roman Church has always taken an unambigious stance against moral evils such as contraception and abortion in ALL cases. I was disappointed to see a statement on, I believe the GOarch website, condoning abortion in cases of life of mother (a medical non-necessity).
I'm currently struggling with this mightley since it is about my last hurdle to Orthodoxy. If someone can point me to some doctrinal resource regarding the Orthodox teaching regarding these things I would appreciate it.