"Sexual intercourse with artificial contraception means implanting something, wearing something, taking something manufactured in order to stop pregnancy from happening."

Yes. SO WHAT? 

NFP is another way to stop pregnancy from happening. In other word, the two are attempting to accomplish exactly the same thing. The major difference is that NFP is an extremely poor way of doing the same thing.

I am near-sighted. I could hold my fingers in front of my eyes in such a way that my eyesight would be sharpened (it's like an extremely small camera aperture will increase depth of field). Instead, I "wear something" ie, eyeglasses, in order to improve my vision. The first method is "natural", the second "artificial"; the first is extremely inefficient, the second works much better (especially since I now need bifocals).

Your problem is that you have bought into the concept that procreation is why people have intercourse. Those of us who live in the real world know better.