The new life is not engendered through an act of love between husband and wife, but by a laboratory procedure performed by doctors or technicians.
In this modern age, we accept it as the norm that children are conceived through an act of love between husband and wife, but it has not always been so. How many marriages were arranged in centuries and millennia past with young girls who only had just had their first period to much older men who were friends or allies of the girls' respective fathers, who didn't even know - much less love - the husband that was chosen for them, who were expected to be obedient and allow themselves to be raped and bear children for the benefit of a dowry or a legal transaction between families. All with the blessing of the RCC or whatever religious ideology was in charge at the time (including currently in certain areas and certain belief systems).
For all the flap the church causes over the unloving atmosphere of a laboratory procedure undertaken by two loving consenting adults whose only "crime" is that they dearly want a child, it's a far cry from other kinds of barbaric "procedures" the church blessed throughout history.