This subject has the ability to go round and round with many different viewpoints
A wife might think its ok to cheat
A husband might think its ok to cheat
A wife and a husband both might think its ok to cheat
A wife and a husband both might think its not ok to cheat
A husband might think its not ok to cheat
A wife might think its not ok to cheat
Either way, people usually find what they are looking for regardless of whether its (a)fair or unfair to another person.