That is a great observation, Renee, and most married couples will spend more of their lives in loving companionship than they will as active sexual partners. As Christ said himself, there is no “marriage” as we know it in heaven, for we all will be married to God. As such, our relationships in heaven will be as brother and sister, if you will, and the loving companionship that is the hallmark of a good marriage is the best training for heaven.
Don’t we all admire those elderly couples we know who’s marriages are marked with a tenderness that is truly and deeply “Christian”?
The practice of NFP, the courtship and honeymoon process the that the sexual dynamic becomes, or rather, was intended to be, is the dynamic God created for us to be heaven trained through marriage.