Natural Family Planning (NFP) is a topic of interest to many different people. There are many different NFP methods based upon systemic observation of biomarkers – changes in cervical fluid and basal body temperature. There has been rigorous research on some of the methods. The Creighton Model Fertility *Care* System is one Natural Family Planning Method that teaches couples to recognize and chart the signs of fertility and infertility in the womans cycle and to use that knowledge to either achieve or avoid a pregnancy. The method is natural, safe and effective, and it helps the couple understand their fertility....