@kb: What is the couple doing to render the act infertile that would not happen anyway? Put another way, the couple is not rendering the act sterile, biology (authored by God) is rendering the act sterile, if in fact the woman is not fertile. Put yet another way, not having sex doesn’t make the woman infertile, she either is or isn’t by the operation of her body’s functions.
Wow, a lot of points to address.
One can quibble about semantics, but the Church is not against the definition of words, nor is the issue truly the definition of words; rather, the Church teaches that it is wrong to separate the procreative aspect of the marital act from the unitive part of it, because God has put them together. I think, however, that it is fair to say that in the realm of moral theology, the Church understands contraception to mean a deliberate action taken to make the marital act sterile; it is something of a term of art within such a discussion. The point is rather that one understands the concepts involved, as opposed to getting bogged down in the terminology. If one chooses to discuss this issue on moral theology sub-forum of a Catholic board, it seems, IMO, to make sense to know what each side means by the terms they use.
Further, efficacy has nothing to do with the morality of either ABC (as understood by the Church) or NFP, nor strictly speaking, do the terms natural and artificial. Lots of artificial things are moral, i.e., setting a broken bone, but that is because it helps the system to function as intended. Birth regulation can be an aspect of responsible parenthood. It is the means of accomplishing that which is at issue. The ends do not justify the means.
As has been noted elsewhere in the thread, “open to life” is a shorthand, and as I think about it, it is shorthand for “does not intentionally separate the procreative and unitive parts of the marital embrace”; however, it is my recollection that the concept is ordered to procreation. In this context, ordered to procreation means that one brings whatever fertility one has at the time of the marital act. Therefore, a post-menopausal woman can, by definition, have procreative sex, in that she is not deliberately blocking her fertility. One can find that an unsatisfying way of describing it, but the concept of not deliberately blocking fertility is the crux of the matter, not whether it is described as procreative or not, if you follow my meaning, kb.
Whew. I’m probably 50 posts behind from what I was trying to respond to. Hope to have more later.