We are getting close. There is more than one issue at stake. There is the issue of whether or not the couple is married, and there is the issue of whether they are fulfilling God’s will at any given time. If a couple marries intending to have children, and then change their mind, they are still married (for once married, always married), but their intent and actions may or may not be moral, depending on circumstances. If immoral, it does not affect the legitimacy of the marriage that already exists. Indeed, if immoral, it is a sin against God and against each other in this real marriage.
From what you say, if a couple exchanges vows with the intent of not having children, then they are not actually married. Therefore, if they later change their minds and do have children, these children are technically born outside of marriage and the family is living in sin? If this intent at the time of marriage is so important to the legitimacy of the marriage, then why do couples not have to undergo extensive interviews to see if they have the correct intentions to marry? From my personal experiences, it seems like any couple that meets a few basic requirements (that can all be proven with documents, like baptismal certificates) can be married in a Catholic church. Somebody may raise an objection to the marriage, but it is considered to be allowable until proven otherwise.
I do not maintain that. I have never suggested that. Whereas it is truth that one must accept the natural purposes of an act, it is poor extrapolation to indicate that this means it can only be for a single natural purpose.
Can we know if an act can or cannot create life? I know of no one who can with any certainty know, at the time of the act, if that particular act can (or will) create life. Many of us do not even know after the act if life was created or not, for God sometimes creates and takes very soon what has been created.
The people I’ve heard talk about NFP always portray NFP as being >99% effective in preventing pregnancy when the couple wants to. If they are intentionally being misleading, then I think there is a severe problem there.
What is meant by open, is that we participate is that particular act with no actions that interfere with its natural purpose. … That is a common belief. However, it is not the most accurate statement. First, we must look at what we mean by ‘act’. What is the ‘act’ of NFP? Can an ‘action’ be ‘not acting’? That would seem to be contradictory, but it seems to be what you suggest.
To reply to this from the bottom up, yes an action can be ‘not acting’. If you knew you could help a person, and all it took was to cross the street or donate a dollar, but you didn’t, you are not being charitable through inaction. If you had a moral responsibility to act, but you didn’t, you would be sinning through inaction. Parents must take care of their children, for instance, and those who neglect them are certainly sinning by not acting. If you intentionally didn’t have sex when you could become pregnant, it is an action, or inaction, that deliberately avoids pregnancy. You deliberately chose to do something other than engage in sex, because you wished to avoid the outcome of the sexual act. This is not to say, directly, that you have a moral responsibility to have sex, although that is the basis for my question.
If you engage in sex in a manner that is not going to result in pregnancy, or more importantly in a manner that you wish not to result in pregnancy, are you not interfering with one of the natural purposes of sex? It sounds a little weird to suggest interference through inaction, but it’s true. If we know what the outcome of events will be, and we do nothing to change it, then we accept and condone the outcome through indifference or inaction. You’re not altering the act in any way, except by avoiding the act entirely when pregnancy is viable. There is obviously no moral obligation to have sex, so “not having sex” is not immoral. However, is it really open to life if you know for a fact that pregnancy will not result? If knowledge of fertility plays a factor in whether or not you have sex, then you’re deciding whether or not to have a child.
If you have a moral obligation to
try to have children, and you knew you were fertile but decided not to have sex because of the fertility, then you decided and acted in a way contrary to your moral obligation. You could turn it around and state that we must need a moral reason to avoid sex under such a circumstance, however there is no moral obligation to have sex on any given day. It is a contradiction to say that we need a moral reason to avoid something we have no obligation to do.