Nah, my parents' marriage is of the "Ancient" Roman kind. A union of houses. Sex was secondary and when they godt bored they agreed to let each other have an affair whenever, no big deal so long as discrete and responsible, no STDs or babbys.
The Victorian Model of monogamy whereby vaginae are placed on pedestals gives the state much power. It was a magic charm spell cast on the populace post-reformation to control the minds of masses and promote repopulation after the cataclysm (caused by a comet, referenced much wizard art, see pic related). In the current cycle of civilization the wizdom of dualism and feeing the higher mind from the lesser mind are both suppressed in favour of making the ape men slaves to their Saturnian/Leaden lower selves. Therefore sexual relation was deified, made unquestionably holy for the masses. The very fact you use the term "cheating" proves it. What is it cheating at?
2 party Marriage and the monogamous relations it promotes is a form of old sex magic for control via Hierarchy approved sex. Application of specific breeding programs is possible within, but the spell is not required in an enlightened society (they can self govern). Monogamy (used to) keep women in check and afford men the tools and wealth to do so, for the creation of specialized crafts. However, parents need not be married to have children, and had it not been beneficial to marry given the social engineering enchantment spells in effect today, my parents wouldn't have wed. Machines alleviate the need for specialized workers (this always happens after a time of rebuilding).
The Lion Cub doesn't give a fuck when his dad screws the whole damn pride of lionesses. He's proud and wants to do the same someday...
You see, the females jocky for social dominance in a group, trying to access the best genetic material, but male mammal breeding strategy is to sire as many offspring as possible. This is best for genes.
"The 7 year itch" happens at about the time a young human mancub can be left alone without too much danger (it can know not to drown, and to forage safely). Humans are not a pair bonding species. They are made to fuck many partners in one life. "Cheating" is no big deal if you're enlightened. The marriage game was rigged against you in the first place, so screw it, it's unnatural, a magical construct that only has power in the minds of the brainwashed.
When the next comet comes, as it always does (look up Napoleon's Comet, the real culprit of the "war of 1812" cover story), then we'll re-emerge, pick up the pieces, and re-write history (again, to keep you ignorant about the cycle) and return to a more enlightened view of sex being as we've discovered how to preserve high technology across such natural [disaster] boundaries. The new robot race will want to come out of hiding and openly have sex with us, you see...
Sorry, no, only unenlightened mundane folks get involuntarily "stressed" over which monkeys are screwing. Never in a high tech society is it that important. It's not like the only blacksmith in town will now fail to have an apprentice... Any batch of idiots can man the robot controlled foundries.