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IVF is considered immoral because it separates the procreative and unitive aspects of the marital act (sex). In Catholic philosophy, the marital act is composed of a procreative aspect (the transmission of the possibility of life) and a unitive aspect (the mutual self-giving of both spouses). IVF inherently lacks the unitive aspect inasmuch as the IVF procedure takes place not within the bodies of the married couple but in an outside, sterile environment. Moreover, IVF as it is practiced in most clinics requires the husband to masturbate in order to obtain a semen sample.

Another argument regarding the morality of IVF is that "extra" embryos--fertilized eggs and, therefore, human beings--are either discarded or indefinitely kept frozen. This amounts to either intentional killing or maintaining a person in a sort of suspended animation. Fortunately, "snowflake adoptions," in which women "adopt" the frozen embryos and then have them implanted in their uterine wall, is growing in popularity. "Snowflake adoption," though does not eliminate the primary problem with IVF mentioned in the first paragraph.

It's against God's natural law. Children are relegated to that as property and not made in the Conjugal act in the sacrament of marriage with God. Excess embryos are created and implanted which are usually miscarried, then the other "children" made in God's image are stored on Ice in a frozen Gulag only to wait to be destroyed or harvested for their body parts in embryonic stem cell research. It's outright barbarous and cannibalism.