I don’t know whether you’re noticed, but this is a Catholic discussion board. We don’t exactly hold to Jewish Tradition. I would guess that you are misrepresenting it somehow, but even if you are accurate, it is irrelevant.
My point in quoting Jewish scholarship here is not to provide a robust argument, but simply to answer the objection to which the quotations were addressed. The purpose is, namely, that to those who are best equipped to interpret the Old Testament, the Jews, the Sin of Onan is not seen by some of their greatest commentators and Torah scholars to refer to contraception, but only to the act of spilling seed (seen by some to say that other forms of contraception are not against God’s law). Because of this ambiguity in the Bible, there would need to be an official Roman interpretation of that passage in order to resolve the issue. There is no such official interpretation, as far as I’m aware, and so even the most stringent Roman Catholic, who holds to the contraceptive teaching, may also conclude that the Sin of Onan has nothing to do with contraception.
The reply to the objection refers only to the objection itself, which is an interpretation of a passage of Scripture, and not the entire argument.
Ecumenical Councils and Ex Cathedra statements are generally held/made when there is serious questioning or heresy within the Church on a matter. This has not been the case with contraception through history even to Vatican II. HV was written when it became a matter of noticeable concern. The next council may deal with the matter more fully. I expect, if so, it will codify HV more fully.
And at such time, if this happens, then my academic argument would have to be mostly abandoned. I think an argument could be made (and I’ve attempted in part to make it, in the articles above) that since the teaching on contraception is disciplinary in nature, no official declaration from Rome in any capacity would be infallible. This is the weaker part of the argument against there being an infallible teaching. The stronger argument is that, as far as I can see, there really has been no attempt at infallibly defining Rome’s position in this matter.
The Church is primarily concerned with the salvation of souls. It is illumined by Jesus Christ to discern that which is good for our souls and warn against that which will drag souls to hell. The Church is not a sophist organization that takes preconceived ideas which it then seeks to justify.
I accept that contraception is morally neutral because of these arguments I have here. In fact, when I converted to the Roman Catholic Church, and before I left (for other reasons), I presented an argument similar to this one to my sponsor, who was trying to convince me to abandon my resistance to Rome’s teaching. Ultimately, we both concluded that I was right on three points: (1) that there is no infallible declaration about contraception. (2) that the teaching on contraception is one of discipline, and (3) that natural law arguments against use of contraception do not work. However, we also concluded, at that time, that since this is still a teaching from Rome, I should still obey it, and refrain from presenting these arguments, because doing so is schismatic.
Later, I left the authority of the Pope, though I remain Catholic, and united myself visibly with an Anglican community. From this vantage, my arguments are less relevant for my position, and more an academic exercise. The only arguments here I still hold to are the natural law arguments (since I still accept the truth and use of a modified version of St. Thomas’s formulation of Natural Law).
I need not hold to the infallibility or discipline arguments any longer, since I reject the authority of the Pope outright.