"Married love, therefore, requires of husband and wife the full awareness of their obligations in the matter of responsible parenthood, which today, rightly enough, is much insisted upon, but which at the same time should be rightly understood. Thus, we do well to consider responsible parenthood in the light of its varied legitimate and interrelated aspects.
"With regard to the biological processes, responsible parenthood means an awareness of, and respect for, their proper functions. In the procreative faculty the human mind discerns biological laws that apply to the human person.
"With regard to man's innate drives and emotions, responsible parenthood means that man's reason and will must exert control over them.
"With regard to 1) physical, 2) economic, 3) psychological and 4) social conditions, responsible parenthood is exercised by those who prudently and generously decide to have more children, and by those who, for serious reasons and with due respect to moral precepts, decide not to have additional children for either a certain or an indefinite period of time" (I added the numbering of the reasons couples can use to make decisions about whether to have more children, as well as emphasis on the words serious reasons).
The take away here is that the judgment as to how many children a couple has is theirs alone to make on the basis of the criteria set forth. It is nobody's business to judge whether a couple who is striving to live their faith in this difficult area, especially given that only about 3% strive to do so in the U.S., and making judgments on the basis of the criteria set forth by the Church, our Mother and Teacher, has sufficiently serious reasons to "decide not to have to additional children for either a certain or indefinite period," except maybe their pastor's, assuming they have a good and supportive one. So, while couples make a vow to "accept children lovingly from God" and marriage is ordered to the procreation and education of children, in addition to the good of the spouses, a couple makes no commitment to have as many children as they physically can, or to have a fixed number (Canon 1055.1). Hence, rigorists who tell people things like, You should be having sex at least three times a week," etc., and that NFP is for wusses are pastorally way out-of-line. It is very much akin to what Fred writes about, but with the procreation bit added in for good measure. Such a rigorist view, too, is inhumane.
Corrected paragraph:
It is important to point out that in English we are working with a translation from editio typica, which is in Latin. So, in number ten, the Holy See translates "seriis causis" as "serious reasons," not grave reasons. In any case, using the word grave is a distortion that has the effect of reducing what we are taught. It is too easy to become ideological about this issue. I prefer using the word ideological to Pharisaical because the Pharisees with whom our Lord took issue were those who were ideological about strict observance of the mizvot.
The rigorist reduction, as with the reduction that occurs among those who reject this teaching, fails to account for the progressive nature of HV by dismissing the encyclical and seeking a return to what the received understanding and teaching of the church was prior to this landmark exercise of the magisterium. HV represents a faithful, organic, and deeper understanding of marital sexuality than had been previously articulated in such magisterial teachings as Casti Connubii. The latter encyclical was the Holy See's response to the Anglicans permitting couples to have recourse to artificial methods of contraception under certain circumstances. The Anglican teaching, set forth in the 1930 Lambeth Conference, was a sudden and dramatic break with Christian tradition and with what had been, at least up to that point, the Christian consensus on what Pope John Paul I called, while still bishop of Vittorio Veneto, "this most delicate matter".
We have no business upping the ante by correcting church teaching, or adding to it. In my own ministry, I strive to always be cognizant of the fact that I am a deacon, not the pope or the bishop. Furthermore, one cannot read HV and not get that abstinence from sexual relations within marriage has a spiritual value. This seems to me to be very much in concert with what St. Paul sets out in 1 Corinthians 7:1-7.
While I am on the subject of human the human subject, I also recommend Sharon's post A Rare Partnership. Suzanne reminded me of a great article by Angela D. Bonilla, published in Homiletic & Pastoral Review. The article is Humanae Vitae: Grave Motives to Use a Good Translation. For the record, I always use the Vatican translation for documents promulgated by the Holy See. If I do not, I state where I got the translation.