I think we do a disservice to anyone interested in NFP if we avoid Catholic teaching on this issue. You do not have to present a “theology of the body.” It may be helpful to remember that when the Pope wrote his Letter to Families in 1994, ten years after he completed his TOB lectures, he did NOT suggest to his intended audience of ordinary laity that they study his 129 lectures. Instead he urged them to remember that the marriage act out to be a renewal of their marriage covenant (section 12). He also reminded them that marriage is for family.
Basic Catholic teaching is simple and makes good sense. Every human person, not just Catholics, has a God-given right to hear it. The right kind of NFP course provides an excellent way to share this part of the truth.
Further, couples have a God-given right to know all the common symptoms of fertility. They should not have to take another course– at more time and more expense– to find out about the value of the temperature or the mucus or the cervix.
John F. Kippley
NFP International
Right to know series ongoing currently at www.johnkippley.com