Adultery today in modern societies has little practical consequence, it is not entirely free of personal consequences but there doesn't seem to be a mechanism that makes you think twice. One of the 7 Noahide laws is not to commit adultery, of course this involves more than marital relations but I am referring to this, this law implies either the individual prone to adultery or it also involves society in the form of the State, the 7th law tells us that serves to judge and penalize the other 6, is there something that society could do and is failing to do with regard to adultery? Does the punishment of the Noahide laws involve the same punishment for the same sin as the Torah laws? Adultery and murder = Capital punishment, theft = Return quadrupled?
In short, what society is failing in practical terms is not to banish adultery but to make it more reflective if it is worth committing it and if the penalties for the laws of Noah are the same as those of the Torah.