If the children are legitimate, then the marriage was valid after all.
Ooops.....
FWIW, jcon, ALL marriages are valid. It's only Catholicism that cooked up that excuse for granting church sanctioned divorce.
afvet, intercourse sets up the one flesh union that binds a man and woman together. When a couple gets married depending on whatever is recognized as a culture, that sanctifies the one flesh union.
In the OT the penalty for any sexual activity outside of marriage was the death penalty, unless it was a single virgin man and a single virgin women. Then the penalty was that they had to marry.
Catholics just want to have their cake and eat it too.
What a convenient religion for people who want to divorce from their spouse without calling it divorce and incurring the judgment of sin, which is what breaking that one flesh union is.