Wow, that sounds too much like the old, unreliable rhythm method. Women’s cycles can vary dramatically from month to month from things like stress, change in diet or exercise, lack of sleep, the flu or other illness…it is much more scientific and reliable to observe fertilty signs which is what most methods of NFP rely on.
. Sometimes that meant we were having more “fun” than when i was on the pill because this built up a natural anticipation and appreciation for that intimate time.
Seriously, though, it just depends. Many things influence “how often” and most have nothing to do with NFP and it’s rules. You’ll probably not get very many people tell you how often–it’s up to the couple and depends on too many factors and changes every cycle. If it seems like not enough to you, then you and your wife need to have a conversation about it…AND review the rules for NFP based on the style you are using.