if you aren't a monk and you have the ability to have children, the church says you need to have children.
I think that's Roman pop stoicism, not the Church. Either that, or St. Paul has some 'splaining to do.
Now, the Church would say, I think, that if you're married you shouldn't refuse to adopt, foster or have children because you want to live it up your whole life (children who would be taught, of course, that their worst foreign enemy ought to be loved like their dearest kin, and that Christ's work ought to be preferred above all fleshly ties). But if you are doing divine work on behalf of all, then spiritual children are begotten in Christ, are they not?