For military and the upper echelon of politicians these matters have very practical security implications.
If a leading general cheats on his wife, foreign security agencies know about it if they're doing a good job. Or they hired that mistress in the first place. Given that you wouldn't accept a cheating significant other in any culture, that can be seriously damaging to the country you work for.
It's not restricted to those jobs too. If two of the biggest companies you can think of compete for a contract, evidence a cheating CEO does not want to reach his wife could easily affect the outcome. That particular extra martial affair is no longer your own private matter, no matter how you try to frame it.
If a leading general cheats on his wife, foreign security agencies know about it if they're doing a good job. Or they hired that mistress in the first place. Given that you wouldn't accept a cheating significant other in any culture, that can be seriously damaging to the country you work for.
It's not restricted to those jobs too. If two of the biggest companies you can think of compete for a contract, evidence a cheating CEO does not want to reach his wife could easily affect the outcome. That particular extra martial affair is no longer your own private matter, no matter how you try to frame it.