[Slyfox]

That is, he will reduce the teaching to an ideal that is worth pursuing, to be sure, but not a divine command to which there are no exceptions, violation of which involves intrinsically disordered and mortally sinful behavior.

Humanae Vitae is a refinement of at least two of the Ten Commandments.

Thou shalt not kill the baby in the womb using artificial birth control.

Thou shalt not desire your neighbor's wife and break up your marriage and then think you can still be a Catholic in good standing and take the Eucharist.

[piusv]

I tend to agree with the comment about HV not focusing on the primary purpose of the conjugal act.

There was a shift in HV to speak of both unitive and procreative purposes together as if they were at least of equal importance except unitive is always mentioned first, so one could interpret that as unitive being more important.

Either way it is clear that procreative is not of utmost importance. This is also how the conjugal act is described in JPII's Catechism. This was not a direct result of Vatican II, but it reflects the same Modernist influence at work.