This paper delineates the impact that use of natural family planning (NFP) and contraception have on the sexual relationships of married couples. NFP essentially helps couples to understand, appreciate, and live with the gift of fertility while contraception involves methods that block, suppress, and destroys fertility. Contraception separates fertility from sexuality and in doing so creates a dynamic that is detrimental to a true conjugal relationship, including an increased risk for divorce. This paper ends with a Table that lists multiple physiological, behavioral, and spiritual differences between use of NFP and contraception by married couples.