NFP is not God's Design. God's Design our anatomy/physilogy is not NFP. What happened is the federal gov/t got a hold of God's Design and through in lies and half truths destroyed what was of God's Design. I found this out, being a teacher under Dr. Billings. Dr. Billings came to New Orleans in 1992 about. I was there for more learning. Dr. Billings spoke before us and was very mad! he said," This is God's NOT YOURS"! And left! I knew later in a few months. I was mailed papers to sign. It was to receive federal $$. for NFP. Oh, NO! I was taught how to read federal grants for the state of AZ. They took what Dr. Billings, a Catholic learnt and took those notes and even book and made sure there was no mention of God! Used wrong phrases such as "unsafe" instead of "fertile" and such. I refused to work with dioceses and even the NFP groups, if they were not with God! So, this all happening out a lot of error in and overlooked what God has Designed.
I do believe in serious reasons. Husband and Wife can learn when abstaining is needed, it is for serious reason. It is not to get grumpy over for either spouse. They both need prayerful lives to understand that we can appreciate what God has given us. Abstaining before we married was very good for us. There is more than sex, souls are involved. We can love each other even more and better.
My suggestion is remember as you get closer to menopause, it is not just women it is very much men. Men get menopause. Know what your needs are in supplements. B complex, D3, B Stress and women Evening Prime Rose Oil.
God is very good. People may not see, that by NFP is wrong they may not see that God is being tossed out? Communism is very clever.
So, more for thought.