I have written on this here and on a long comment on another blog. Michael is absolutely correct here. As one trained in NFP and having taught NFP, I know that the Church's teaching and intent is that it is a temporary need and only to be used in serious circumstances.

Interesting that this topic has come up of late quite a bit.

Thanks, Michael, for holding up the truth. NFP is Catholic birth-control-it is control of conception.

Dr. Jay Boyd is another source for good teaching.

http://philotheaonphire.blogspot.ie/2013_09_01_archive.html

And, a good website

http://www.ccli.org/

and from that site...

Top 10 myths about NFP

There is a lot of misinformation floating around about NFP and the Catholic Church’s teaching on marriage and sexuality. Do you recognize any of the myths below? Read on to get the “straight scoop!”

Myth #1: I’m not Catholic, so the teaching against contraception really doesn’t apply to me.

Myth #2: NFP spoils spontaneity—its charts make marital relations a clinical exercise.

Myth #3: NFP harms marriage through a lack of physical intimacy.

Myth #4: NFP users have large families because the method doesn’t work.

Myth #5: If you practice NFP you should use barrier methods during the fertile time “just to be sure.”

Myth #6: NFP is only for good marriages.

Myth #7: Popes have no firsthand experience with sex, and therefore should not be considered “authorities” on the subject.

Myth #8: Doesn’t the Church teach that every sex act should have procreation as a goal, and thus a couple must have as many children as they physically can?

Myth #9: NFP is too hard to learn.

Myth #10: NFP is the same as contraception.