Children are the FRUIT of marriage as was said above.
Yes, but as I asked before, why be needed to perform the act if it won’t ever resullt in this fruit?
If I read Canon 1055
The matrimonial covenant, by which a man and a woman establish between themselves a partnership of the whole of life and which is ordered by its nature to the good of the spouses and the procreation and education of offspring, has been raised by Christ the Lord to the dignity of a sacrament between the baptized.
§2. For this reason, a valid matrimonial contract cannot exist between the baptized without it being by that fact a sacrament.
So either the good of the spouses is as much a fruit of marriage as children are, or children are needed. But since children aren’t needed to contract a marriage, isn’t the good of the spouses needed? If yes, then this fruit, the good of the spouses, is a needed fruit…
I just don’t see how something ordered also to procreation can be so, if intercourse may remain without result. I don’t see why it changes anything that sterility is hard to diagnose. There is surely always hope and openness towards these fruits, but in the case that sterility is for life, why is this a valid marriage? I don’t see why it is the mere act of sexuality, which would points towards nothing.
In the aticle “Why the Church cannot marry the impotent”, Trent Horn makes the following note to a passage:
" Infertility is not an impediment in and of itself, but it can be an impediment if it is known prior to the marriage and is not disclosed. This is what paragraph three refers to when it references canon 1098."
So in that case, if this is correct, sterility is an impediment, which would make sense to me.