So far, I have used NFP to avoid pregnancy for a total of 43 cycles, and have a 100% effectiveness rate. So you know you’re dealing with someone who is fairly likely to get pregnant otherwise, here’s the other stat: Of the 9 months that I was neither pregnant nor trying to avoid pregnancy, I conceived 3 times. In other words, the NFP worked very well for me.
Yes, there is a degree to which spontenaity is reduced. The requirement to discuss your fertility with your spouse before you engage in the marital act can be challenging at times. The fact that when we do have relations when I am fertile, I am very aware of the higher likelihood of conceiving, does make it less spontaneous.
On the other hand, Overcoming these challenges (such as communication) is making my relationship with my husband stronger. My increased awareness of the conception that may be happening helps me be awestruck by the miracle of life. The other thing to consider, is how necessary it is to use any method (including NFP) to avoid a pregnancy. The only way to be truly spontaneous is to not use any method at all, and just be open to whatever life comes your way.
As far as it being too hard to use: As someone who has never used anything but NFP, the idea of all the downfalls of condom use (not the least of which is that it is LESS effective than NFP) or any other contraceptive, is very daunting to me. I’m so glad I don’t have to be responsible for keeping enough on hand, or watching the expiriation date, or taking a pill every day, or having physical side effects, or never knowing what the real act of marriage really feels like since there is always a barrier there… There is no difficulty-free way to avoid pregnancy. Your fiance is just deciding that he’d rather stick with the difficulty he’s familiar with.
God Bless,
TKC