I believe the main issue with IVF revolves around what happens in the lab with the egg/sperm/zygote.
If there is even the slightest chance that these may be abused in some way, then the whole process is negated.
Neither husband, nor wife, have control over their reproductive material once it has left their bodies. The woman truly doesn't know how many eggs have been harvested, nor what has been done with them. Neither does the husband know what his sperm will be used to fertilize.
As for the zygotes, well, it stands to reason that they "store" the "extra" to be used if the first attempt of implantation fails. However, if they implant 8 zygotes, and all 8 take hold....what now?
Now we have a critical pregnancy that often results in the loss of fetuses because of overcrowding, etc.
Furthermore, can the couple actually support 8 children of the exact same age, and give them the upbringing they deserve?
At this time many parents choose to abort a certain number of the embryos.
What of the zygotes that are still in deep freeze? Technically, as stated above, they ought to be implanted at a future date. Well, what if the mother is already in her 40's, and implanting will most likely not be successful in the future, without much added hormone therapy, which in itself is questionable, because of the harm it causes the mother's body?
What if, while the little innocents, are lying in a freezer somewhere, the new parents struggling with raising 8 kids, decide they cannot possible handle any more? What if due to these struggles, the couple divorces?
What's to become of the 5 additional zygotes in the freezer? Buried before even living? Is that fair to those 5 individuals?
This is a very complicated process, with many, many things to take in to account.
Unfortunately, most couples, blinded by their desire to procreate, never think about any of these possibilities, or often don't think of a zygote as living, while Joey, Suzy, Olga, Mike, and Sam lye freezing in a synthetic container next to Johnny, and James.
When all these possible abuses are contemplated, which in all honesty cannot be controlled by the couple, it seems like other avenues ought to be explored - adoption, foster care, etc.
I completely understand the pain and the yearning of the married couple to have children. However, one must consider the fate of all those children, not just the lucky one or two who actually get born to see the light of day.
My prayers for all couples who find themselves in this situation.