Q:

Why did Monica and Chandler not consider in vitro fertilization?

In S09E22, "The One with the Donor", we see Monica and Chandler go to the doctor where they find out their best options for conceiving are surrogacy, insemination and adoption.  
I'm not the most knowledgeable about all these conceiving techniques, but wouldn't it have been an option for them to have an embryo created in vitro with Chandler's sperm and Monica's eggs and implanted in Monica's uterus?
We know she could get pregnant, because otherwise insemination wouldn't have been an option.
We also know that Chandler's problem is that his sperm has low motility, but I don't think that would come in the way of an in vitro conception
to recap, why didn't they consider in vitro fertilization?

A:

No in-universe reason is given, but if the producers considered it at all, they might have discarded it for one or both of two reasons:

the show already had an IVF arc -- Phoebe bearing children for her brother.  Indeed, it also had a pregnancy arc (the gestation and birth of Emma), so they were running low on new ways to produce babies.
the show was in its last season.  If they wanted to end with "the start of a new beginning", IVF, and ordinary conception, would have taken an unreasonable amount of screen time to seem plausible without an awkward time-skip.

