The cervix is higher, softer and open around the time of ovulation, whereas at infertile times it is lower, firmer and closed. Most highly-motivated couples can use natural methods. No, although when first explained it may sound complicated. With experience and support while learning, it becomes easier. It is 'natural' in that no drugs, foreign bodies or chemicals are used.
Some couples have objections to other methods on religious or moral grounds.
Family planning becomes the responsibility of the couple rather than of an individual. Natural family planning methods can help to develop other aspects of the marriage relationship. The practice of abstinence enables many couples to develop a broader understanding of intimacy and expression of love. An awareness of fertility through Natural Family Planning methods may help couples who have difficulty in conceiving a child. From a scientific point of view natural methods have a reliability comparable to other methods of family planning.