Another aspect of the “side-effects” of NFP use (or perhaps it would be better to say “over-use”) is brought out in several comments that related NFP use to the “feminization” of the Church and the family. For instance:
The poor man, he never got to say anything and his wife never passed up an opportunity to talk about how NFP enriched their lives. He just stood there and nodded. I think he really enjoyed his time away from his wife and going to games with my husband. Neither their son nor their daughter ever expressed any interest in marriage.
In addition to having fewer kids, I have found the NFP parents are always trying to get away from them by taking vacations alone. By contrast, the so-called "providentialists" can't seem to get enough of them.