Some interesting writings on this topic (or very closely related topic):
On the second piece, go to page 420 for the relevant discussion. Moral theologians are not in agreement on this point. Apparently, neither are the bishops. A perforated sheath (or condom) allows some fluid to enter the woman while collecting some for testing and potential subsequent reinsertion with eggs. The theologians who endorse this practice say that as a result of the perforations, the marital act is not frustrated. It is both unitive and open to potential procreation. It is what happens after that is more troubling in my view. What do the medical experts do with the collected fluid and is that morally permissible?
Like I said, I don’t know, and neither do minds better than mine. However, I do know that couples struggling with infertility are real people with real life problems, and they are working hard to overcome those problems in a way consistent with church teaching. It would be flippant of me to counsel them with “if in doubt don’t do it”. How cold, unfeeling and lacking in empathy and compassion would that make me?
These are very tough issues. We need to pray for these couples and for our church, that it provide them with some better guidance (and those of us who counsel them) than it presently does.