Thanks to both of you for respecting different others' opinions, and I'll try to return the favor, but, unfortunately, we disagree again.
First off I'm going to defend NFP because I've read a stat saying that it is 99% effective (it could be wrong, but it was a legitimate source), and that seems to be just as effective as forms of birth control. Also NFP implements sacrifice, which should be an important part of any relationship (Ephesians 5:21-33 -Be subordinate to one another out of reverence for Christ. Wives should be subordinate to their husbands as to the Lord. For the husband is head of his wife just as Christ is head of the church, he himself the savior of the body. As the church is subordinate to Christ, so wives should be subordinate to their husbands in everything. Husbands, love your wives, even as Christ loved the church and handed himself over for her to sanctify her, cleansing her by the bath of water with the word, that he might present to himself the church in splendor, without spot or wrinkle or any such thing, that she might be holy and without blemish. So (also) husbands should love their wives as their own bodies. He who loves his wife loves himself. For no one hates his own flesh but rather nourishes and cherishes it, even as Christ does the church, because we are members of his body. "For this reason a man shall leave (his) father and (his) mother and be joined to his wife, and the two shall become one flesh." This is a great mystery, but I speak in reference to Christ and the church. In any case, each one of you should love his wife as himself, and the wife should respect her husband.). You're right sex isn't just for reproducing, but it is not just for pleasure either. Sex is a powerful, mysterious thing: it has the power to bring a couple together, or to tear them apart. Obviously it serves a deeper purpose than recreation.
My problem with birth control is that it seems to deteriorate the family because if you don't reproduce children with your partner(s), you seem to be off the hook. Thus in a way it encourages casual sex. I also believe that it has led to the creation of many more STDs. I believe that sex creates such a strong bond, it should be shared between two married partners. Sex is meant for both pleasure and procreation, and the two go hand in hand. If you have sex and become pregnant as a couple, you will experience the joy a child brings.