"Husbands, love your wives,
even as Christ loved the church and handed himself over for her...
So [also] husbands should love their wives as their own bodies.
He who loves his wife loves himself."
(Eph. 5: 25, 28)
Natural Family Planning is a key to marital happiness... it allows for the total self-giving of husbands and wives as they express their love sexually - there are no barriers; their union is complete. It also requires discipline, sacrifice and constant communication. That means that both husband and wife must be fully invested, and yes, NFP for men means that at times husbands will need to forgo sex for other ways to express their love for their wives. So where does the marital happiness come in?