Comment by chime

In the US the difficulty (factoring in stress, disappointment, and costs) of various options for infertile partners in ascending order:

  * IUI
  * IVF
  * IVF with egg donor
  * IVF with donated embryo
  * Surrogacy
  * Adoption (direct, not foster)

Unfortunately "Why not adopt" is rarely the simplest option for most people.