If they’re good rationalists overall, they could also establish as common knowledge that they both timelessly decide not to predict/estimate their spouse would wish to know something which is known by themselves to be likely to bring about lower total utility to them both than if the spouse had never wished to know it, whether the spouse knows of this or not.
If they’re good rationalists overall, they could also establish as common knowledge that they both timelessly decide not to predict/estimate their spouse would wish to know something which is known by themselves to be likely to bring about lower total utility to them both than if the spouse had never wished to know it, whether the spouse knows of this or not.