Artificial insemination produced in a marriage by the active element of a third party is equally immoral and consequently to be condemned without appeal.
Only the spouses have a reciprocal right upon each other’s body to generate a new life: an exclusive, inalienable right, which cannot be ceded. And so it must be, even out of consideration for the child. On whoever gives life to a small being, nature imposes, by the very strength of that tie, the duty to keep and educate it. But no ties of origin, no moral or legal bonds of conjugal procreation, exist between the legitimate husband and the child who is the fruit of the active element of a third party (even if the husband has given his consent).
As far as the legitimacy of artificial insemination in marriage is concerned, it suffices, for the moment, to recall these principles of natural law: the simple fact that the result desired is obtained by this means does not justify the use of the means itself; nor does the desire of the husband and wife, in itself perfectly legitimate, to have a child, suffice to establish the legitimacy of resorting to the artificial insemination which would satisfy this desire.
It would be erroneous, therefore, to think that the possibility of resorting to this means might render valid a marriage between persons unable to contract it because of the _impedimentum impotentiae_.
On the other hand, it is superfluous to mention that the active element can never be obtained legitimately by means of acts against nature.
Although new methods cannot be ruled out a priori for the sole reason of their novelty, nonetheless, as far as artificial impregnation is concerned, extreme caution is not enough; it must be absolutely excluded. Saying this does not necessarily proscribe the use of certain artificial means destined only to facilitate the natural act, or to assure the accomplishment of the end of the natural act regularly performed.
Let it never be forgotten that only the procreation of a new life according to the will and the designs of the Creator brings with it, to a marvelous degree of perfection, the accomplishment of the proposed ends. It is at the same time in conformity with corporeal and spiritual nature and the dignity of the married couple, as well as with the healthy, normal development of the child (Address to Physicians, Sept. 29, 1949, _Discorsi e Radiomessaggi_, vol. xi, pp. 221 ff).
2) We also believe that it is of capital importance for you, gentlemen, not to neglect this perspective when you consider the methods of artificial fecundation. The means by which one tends toward the production of a new life take on an essential human significance inseparable from the desired end and susceptible of causing grave harm to this very end if these means are not conformable to reality and to the laws inscribed in the nature of beings.
We have been asked to give some directives on this point also. On the subject of the experiments in artificial human fecundation “in vitro,” let it suffice for Us to observe that they must be rejected as immoral and absolutely illicit. With regard to the various moral problems which are posed by artificial fecundation, in the ordinary meaning of the expression, or “artificial insemination,” We have already expressed Our thought in a discourse addressed to physicians on September 29, 1949 (_Discorsi e Radiomessaggi_, vol. xi. pp. 221 ff.). For the details We refer you to what We said then and We confine Ourself here to repeating the concluding judgment given there: “With regard to artificial fecundation, not only is there reason to be extremely reserved, but it must be absolutely rejected. In speaking thus, one is not necessarily forbidding the use of certain artificial means destined solely to facilitate the natural act or to achieve the attainment of the natural act normally performed.” But since artificial fecundation is being more and more widely used, and in order to correct some erroneous opinions which are being spread concerning what We have taught, We have the following to add:
Artificial fecundation exceeds the limits of the right which spouses have acquired by the matrimonial contract, namely, that of fully exercising their natural sexual capacity in the natural accomplishment of the marital act. The contract in question does not confer on them a right to artificial fecundation, for such a right is not in any way expressed in the right to the natural conjugal act and cannot be deduced from it. Still less can one derive it from the right to the “child,” the primary “end” of marriage. The matrimonial contract does not give this right, because it has for its object not the “child,” but the “natural acts” which are capable of engendering a new life and are destined to this end. It must likewise be said that artificial fecundation violates the natural law and is contrary to justice and morality [1] (_Marriage and Parenthood_, May 19, 1956). See _The Pope Speaks_, Vol, III, No. 2, Autumn of 1956, pp. 194 ff.