Discussions on NFP should be offered in the parish and then easily accessible classes in the diocese. In the Diocese of San Jose, couples are required to take an introductory NFP class before they can be married in the Church. This is a good first step. Only 10 percent of the couples sign up for the advanced program, often after they have been married and have confronted the negative side of artificial contraception. An obvious improvement in overall participation would be requiring ALL the classes and underwriting the cost.
Priests can try a little Socratic dialogue here.
Let's consider body weight. Well, Natural Family Planning is like watching your calories. It will postpone conception. And it is the right way to do it. Artificial contraception is like regurgitating your food.