Two issues here;
How is the deliberate timing of coitus based on the female fertility cycle anything other than a mental act of contraception…
V I think this is where we seem to see things very differently and am wondering if we can tease out the root cause of the difference in view.
Perhaps I am wrong but either you may not fully understand “virtue based ethics” thinking (and how it influences Catholic moral definitions) OR you point blank disagree that ethical definitions should incorporate them into the medical definition itself.
For the Church the evil of “contraception” is not in the simple choosing to use physical prophylactics or hormone pills. Some Catholics tend to talk in this way but when scratched I think they, and most of us, realise the evil is not simply in the chosen physical use of these things.
Rather, most realise there has to be an intent to use these technical things (or technical methods like Mr Onan) for the very purpose of preventing pregnancy. Hence taking “the Pill” for a purpose other than preventing pregnancy (eg professional runners to delay a period at an important event) would be acceptable even if that runner was married and sexually active and in fact causing an actual pregnancy not to happen.
Medically the above woman is indeed “contracepting”. She fits the medical criteria of that word…she has chosen a technique that she knows will prevent a conception that would have happened had she not.
However, morally, this choice does not meet the Catholic definition of “contracepting.”
You may disagree. Medically you are correct.
Nevertheless, whether we agree or not, the Church does not define human actions in a post-enlightenment “physicalist” way.
It operates from a pre-enlightenment manner of defining human actions, one based on the virtue ethics of Aristotle, such definitions also embed the agent’s purpose to some extent.
So when we speak of NFP is that “contracepting”?
The Church says it isn’t.
Medically, perhaps it is … its a sort of physical technique, although even at a physical level it is perhaps a borderline predication. No chemicals are involved, no physical barrier is involved. Even “the sin/technique of onan” (withdrawal) is more obvious physically (a form of “barrier”?).
We can certainly say the couple is exploiting a natural contraceptive opportunity built into nature itself I suppose. That is quite different from withdrawal of course.
SO there is the difference I see between NFP and say onanism. The former respects the inherent teleology of coitus, the latter does not.
I accept both can, from a physical/medical point of view validly may be called “contracepting”.
Regardless the Church sees the former as acceptable while the latter is not. Therefore, from a virtue based ethics nomenclature POV, the former is NOT “contracepting” but the latter is.
The intent to “contra” the coital teleology (not the “coeptum”) is the real issue.
Perhaps we should really speak of the immorality of contracoitum not contracoeptum.
(Yes I know “coitus” is masculine not neuter
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