re: Anyone here use Natural Family Planning?

"Then God said, “Let us make humankind in our image, according to our likeness" Gen 1:26

Both Man and Woman are made in the image of God. To be so different and both be an image means that neither man nor woman individually is a full reflection.

If both only present an incomplete reflection; then only when they join together can a more full image of who God is be seen.

Therefore the closest we have on earth to the full image of God is what is reflected in the joining of a Man and a Woman through the Sacrament of Marriage.

Sex is a physical expression of love between a Man and a Woman and should be saved for marriage because so powerful is just this reflected image of God that through the joining of a man and a woman - God has chosen to share His power to create life.

Putting all of this together:

The earliest foundations of Judeo-Christian morality is built upon the idea that men and women must join together to reflect God's love. So powerful is this idea; the most godly power known to man (to create life) is reserved for this particular foundation.

God chose that the world would only get to see a more complete reflection of who is through the love shared between a man and a woman. So powerful is that love - He gives us the power to create life. He then gave us His church to protect the gifts He gave us. So to me, it makes perfect sense why the Catholic Church is so caught up on Sex. Sex is what our entire existence is predicated upon. Existence in both the physical and spiritual realms.