When a real woman has exercised her right to choose her husband and she has done so following her intuition and not her callous intellect , and she supports and loves her husband totally, there will certainly be no need for a
side chick/concubine/mistress/backup wife etc.
A real woman will choose a good man as guided by her intuition which is never wrong.
A real woman will nurture her good man to economic success hence there will be less fights due to lack.
A real woman will attend to the core needs of her man (respect, affection, support and great sex)
And then, a successful, happy and fulfilled man all thanks to this wonderful real woman must then be crazy if he decides to toy with the "good thing" that has helped him to obtain favour from the lord if he start fornicating. What else is he looking for

?
But when this is not the case abinitio, then from a logical standpoint, Toks' advocacy kind of makes sense. Nature abhors lacuna, whatever is missing in a relationship will secretly or openly be indulged in.
All women should work on themselves to become real women as defined above (not turning to an SU ooo) and then, we will see a better and decent society.