If there were such prevalent problems with adoption, it wouldn't happen all over the world. It's also great for stabilising the world population, instead of creating more kids, why not just adopt local kids?

I don´t care about world. My friend is adopted and he has a complicated relation with his parents. Maybe this problem is not so sharp in the anglo-american societies where is the long tradition of nannies, who can fill the emotional vacuum in normal families. The same holds for the homosexual marriages.