This answer accords with what you have published previously. Your point is that the Act ‘done’ by the couple (which can be viewed as “take this medication while intending to have marital relations” or “have marital relations given that the medication was taken”) IS the Act of “contraception”.
You are familiar with the quote:
*On the other hand, the Church **does not consider at all illicit ***the use of those therapeutic means necessary to cure bodily diseases, even if a foreseeable impediment to procreation should result there from—provided such impediment is not directly intended for any motive whatsoever. (Paul VI, Humanae Vitae, 15) I believe he is saying that contraception is not merely the physical, observable act. The intention of the will (in connection with the Act, the 2nd font, not the first!) matters.
If you disagree Ron, then can you please say what treatments Paul VI was alluding to as not being illicit?
Catholic moral teaching is based on the three fonts of morality. If you don’t understand the fonts, you won’t be able to arrive at a correct moral judgment of a difficult question. The three fonts are intention, moral object, circumstances. A change in intention or circumstances cannot transform an intrinsically evil act into a good act.
The inherent moral meaning of the act is determined by its moral object. The act is chosen by the will. All three fonts involve the will. But in the second font, the will chooses an act, and the act is, in and of itself, good or evil based on its ordering toward a proximate end.
The act of wearing a condom while having marital relations is inherently contraceptive; it thwarts the procreative end of the act. The act of taking a contraceptive pill and then engaging in marital relations is inherently contraceptive because the pill thwarts the procreative end. The intentional choice of a disordered act is intrinsically evil. The reason for choosing the act cannot make the act good.
The intended end might be to avoid procreating a child, or it might be to treat a medical disorder, or it might be to please a spouse, or it might be some other motivation. But the disordered act remains intrinsically evil.
The same thing occurs with direct abortion. When the intention is to save the life of the mother, the direction killing of the innocent prenatal is still gravely immoral.
“The deliberate decision to deprive an innocent human being of his life is always morally evil and can never be licit either as an end in itself or as a means to a good end.” EV 57
However, when the act is NOT the direct killing of an innocent, but rather the removal of a cancerous uterus, then the act is not intrinsically evil. But we still must evaluate intention and circumstances to see if the overall act is moral.
The idea that HV 15 permits condoms and abortifacient contraception is ridiculous. It is a recent innovation. If Paul VI meant to permit contraception in those cases, it would have been big news long ago, it would have been seized by the early opponents of HV as a way to permit contraception (for there are many possible medical intentions).
Church teaching on this more general point has been clear for along time. Some types of acts are intrinsically evil and always immoral, regardless of intention or circumstances. It does not transform into a good act by a change of intention.
HV 15 refers to indirect sterilization, such as a hysterectomy to treat a grave medical condition. The act is ordered toward treating the disorder, and so it is not intrinsically evil.
You said “The intention of the will (in connection with the Act, the 2nd font, not the first!) matters.”
But this contradicts the teaching of the CCC and Veritatis Splendor that some acts are immoral regardless of intention or circumstances. The second font is the intentionally chosen act with its inherent ordering toward a good or evil end (the moral object). The first font is the purpose for which the act is chosen. The thing to understand about all intrinsically evil acts is that they are immoral by the nature of the act, not due to a bad intention or bad consequences.