Ok I’ve read every reply and and now I am ready to jump in.
Mike182d and greenfrog are making some great headway. but there is one thing that you both agreed on that I don’t agree. Years ago I used to have greenfrog’s seemingly valid position. Why I changed and am actually now an NFP promoter is due to the one area that I disagree.
When I say it I know Mike182 will say “oh yeah that is important.” and will help me find the documentation on it.(please?

) Otherwise I agree with everything else he said and all I can say is wow, you rock Mike! I also suffer long bouts of infertility so I can answer that concern also.
Here goes:
Greenfrog and Mike182 said they agree that the primary functions of the marital embrace are procreation and unity. This is almost accurate. Here is why NFP is different than condoms:
All created things have a natural order: i.e. Conception must occur before birth and birth must occur before death. The hair on the face must grow before it can be shaved off. This list can be added to forever. Everything created has an order.
The marital embrace has an order too. Procreation is the primary purpose and unity is the secondary purpose. This is wherein lies the difference. ( I know this is documented so this is where I need the help please, Mike.)
To introduce a condom makes the secondary purpose (unity) above the primary purpose and that causes it to be dis-ordered. This is what caused me to change my opinion. Since God is the author of order to change the order is to try to change God.
Some may doubt that there is a natural order. I can guarantee that procreative sex has been going on since before we humans discovered that sex was unitive.
This brings me to the “infertility-menopause” stuff so loosely flying around. NFP is also for those of us who have spaced fertility. We abstain when God asks us to, (7 months post-partum was NOT a problem,) but every time we have sex we are procreative even when we know we are infertile! Procreative and reproductive are not the same thing.
Since my husband and I engage in the natural order of things we are blessed. We have lots of procreation in our marriage and an exactly equal amount of unity. Our reproduction has been only one so far. We’ll keep trying though!
Finally, (I know I’m long winded) The pleasure aspect of sex is not a purpose or a function of sex. It is an incentive to do what is good for us. Eating and sleeping are pleasurable for the same reasons.
Greenfrog, does this help?