How does periodic abstinence affect the couple’s relationship?

In a five country trial, the WHO found that “marital friction” as a result of periodic abstinence was uncommon in 80-99 percent of cycles according to both men and women. In this same study, over 95 percent of both men and women rated their satisfaction with NFP as good or excellent. Couples using NFP report increased and enhanced communication, increased self-esteem, and enhanced spirituality.