The embolden part is fallacious reasoning. To posit that a couple is not open to conception at all other times, simply because they use the Rhythm Method during the fertile period, is fallacious. You're making a leap that doesn't follow reason. It would be equivalent to saying that a person who kills someone, legally, has no problem killing at any other time. It doesn't follow. Were the Rhythm Method not allowed by the Church, the Sacred Penitentiary would have said so. You act as if you are more experienced in moral theology than the they were. These men were arguably some of the most knowledgeable moral theologians in the Catholic Church at the time. That's why they were chosen for the post.
No you moron, if one is using the Rhythm Method their intention is of course not to conceive. The Rhythm Method is designed to prevent conception, so no one is using it unless that is their intent. IF THEY WERE INTENDING TO CONCEIVE WHEN THEY DID HAVE RELATIONS, THEY WOULD NOT BE USING THE RHYTHM METHOD. It would be COMPLETELY POINTLESS. If you are trying to conceive, you do not limit yourself to your wife's infertile periods. You do not use
CONTRACEPTION unless you are trying to
PREVENT CONCEPTION. THAT IS LITERALLY THE MEANING OF THE WORD
There is no such thing as only using the Rhythm Method during the fertile periods. The Rhythm Method is abstaining during fertile periods and having relations only during infertile periods, for the sake of preventing conception. Having sex during infertile periods is part of the method, it is designed to be a way to let couples have sex without conceiving. If the couple had the intent of conceiving, they would not be limiting relations to the infertile period. They would not be using the Rhythm Method. Anyone who is using contraception is CLEARLY not trying to conceive BY DEFINITION, and therefore they are sinning venially