The purposes of marriage are 1) Children 2) mutual help offered to the spouses 3) quieting of concupiscence.
It seems to me your are denying your husband #3. #3 is a huge reason why a lot of men, especially Catholic men who are religious and could have probably been decent candidates for the seminary get married. While it is always said that men can never understand how difficult childbirth is, women will never understand how we men suffer with vehement temptations against the flesh sometimes for days. If your husband is telling you that he doesn’t want to deal with NFP anymore, that really means he is on the verge of giving in to mortal sin-- masturbation or the such.
Most men do have a problem with masturbation before they are married (believe me even religious guys) and marriage is actually a solution. That is why your spouse really does help you to get to heaven. I was told this by a priest as well. So don’t be selfish and let your husband fall into mortal sin. If you get pregnant, just trust in God. ***
It has always been taught that to refuse the “marriage debt” is a mortal sin. It is in moral theology manuals and catechisms. I am sure if you looked in the Denzinger you could find some type of statement about it.
The purposes of marriage are explained in Casti Conubii by Pope Pius XI
If NFP is used it must only be used in serious cases cases. Listen to this audio file:
I am glad I stumbled upon this thread because this is something that really needs to be addressed before marriage. I really don’t want to be in this situation some day.