Introduction: Natural family planning consists of methods that enable recognition of fertile days in the menstrual cycle. Observing, recording and understanding fertility signs of human body form the basis of all natural family planning methods. This information is useful for self-awareness, health literacy and family planning. Purpose: The purpose of this paper is to present natural family planning, including its benefits and possible harmful effects. Our aim is to discover more about effectiveness of natural family planning methods and their impact on the partner relationship. Methods: A descriptive work method was used, we examined professional and scientific literature of referred area. A systematic review of literature was obtained from Cochrane Library, PubMed, ScienceDirect and Springer Link. Collected literature was not older than ten years, fully accessible and its origin was in Slovenian or English language. Results: Effectiveness of natural family planning depends on couple's desires. Perfect and typical efficacy rate varies among studies. Natural family planning methods can achieve same efficacy as hormonal contraception. Further studies about special reproductive phases are needed. Natural family planning affects partner relationship. Continuous use could reduce the likelihood of divorce and contribute to more satisfying relationship. Periodic abstinence strengthens the marital relationship. Natural family planning facilitates communication about sexuality, improves the quality of sex life and enhances understanding of it. Discussion and conclusion: Information about the effectiveness of natural family planning is difficult to access due to diverse authors' conclusions. Its effectiveness highly depends on user motivation. The practice of natural family planning increases the likelihood of a functional partner relationship. Some say, that these methods are harmful due to reduced spontaneity, periodic abstinence and fear of getting pregnant. Others do not agree and believe that the effort is worthwhile. Natural family planning lacks strong research evidence; therefore, new researches are needed. To effectively present methods of natural family planning to patients, healthcare professionals, including midwives, should have more up-to-date knowledge about them.
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