FWIW, businesses have almost always been amoral. People change employers all the time. There's no fidelity or "loyalty" between employers and employees but there never has been so it cannot really be blamed for the decline in marriage fidelity.
OTOH, tales of philadering presidents - going all the way back to JFK and the cheating royals in the UK - somehow serve as an example to the public. Remember the mini-baby boom that took place when Princess Di got pregnant? Suddenly, it was chic to be preggers.
It really *shouldn't* serve as an example. We shouldn't base our morality on fallable heads of state but, for a certain segment, it seems to be true. What was the excuse we heard for two years from the Clintonites? "Everybody has affairs. Everybody lies about sex, etc." They not only were trying to excuse their president, they were sending a signal that such behavior was "ok", even if you weren't the leader of the free world. The media pounded this message home constantly. It should be no surprise that a certain percentage of the peoens took it to heart.
Toss in a media culture that champions immorality and castigates people who are faithful or true to a spouse of the opposite sex and it's easy to see how it signaled open season on cheating.
I actually remember when there was loyalty in business -- employers to employees and employees to employers. It did actually exist. Really. Back in the early 1980s I met a guy who was so proud to work for IBM that he had actual letters of praise from a vice president framed in his livingroom. Today the guy would be seen as a joke.
But yeah, it's the media, it's public public figures and all the rest. People see it and figure "no biggie."
It's also discussed more today. More out in the open...