[A CA Guy]

You don't need contraception if you are smart, there are ways. For instance the man can masturbate first and then in a while go with the wife. Very tough for a time right after to have a love explosion but you two can have lots of marital time,
That is a way they could use nothing and not get pregnant.

If they happened to already have 3 mentally challenged children in a row before going for #19 like Octommom, would people be going AHHHHH God said keep them coming?

This is NOT God's plan, it is their's and their choices.

Having already a gazillion kids and risking more over 35 is an issue.

[impimp]

Masturbation is a sin.

You do not value all life equally. This means that your morality has been compromised by the devil.