The Church opposes the confusion of love and economy. In some cases, our culture nods her head in approval. After all, this is the reason it’s a sin — and a heinous one — to promote loveless sex, sex which views a man as a sperm-bank and woman as a functioning uterus. This is one of the many reasons the Church condemns rape. This is one of the many reason that the Church is so heroic in opposing gendercide — the intentional abortion of baby girls. These evils are all evils of economy, that Wal-Mart category that counts the costs, that meets demand, that owes and is owed, and that has as much to do with love as porn has to do with a culture free from sex-trafficking — that is, nothing at all.
But when the Church opposes IVF for the exact same reasons, the culture rage quits. I understand the anger, I really do, for there is nothing so emotionally painful as infertility, nor anything so understandable as the use of artificial reproductive technology to alleviate that pain. But let’s take a step back and look at the thing.
It's well worth the read to see the link that love, life, dignity, fruitfulness and marriage share. It's a delicate issue, certainly, but Marc Barnes' articulation is a good place to start.