It is pretty common when the couple does not have its own eggs or sperm. Either a single woman, who has no eggs, wants to use a donor sperm. Surprisingly for her, in this case she will actually have to take the egg from a donor female. In all these cases the donor embryos are used (embryos from donor eggs fertilized by donated sperm). Realizing that genetically born baby will be biologically unrelated to them, patients often assume that in this case it is better to take the baby from the hospital!
It is important to understand that this is not the same thing. The adopted child was abandoned his/her parents (usually, asocial people suffering from alcoholism, drug addiction, mental illness). The number of sick and defective children among adopted children is very high. The child born from a pair of donors must be prosperous in all respects: its genetic parents (the donors) are socially and mentally normal people, carefully selected as a result of a detailed and comprehensive examination. They have their own families and almost always they have their own children. You should not ignore the fact that the surrogate mother has a biological link with the future child.
Experience shows that after a short period of time "donor" children perceived by their parents as genetically related to them.