Eh, I think they wouldn't care except that both affairs are potential conflict of interest issues. If it were like a random person with no connection to the business that he had an affair with it'd be treated as less of an issue I think.

..and because American culture is really prudish about that.

The French and Italians wouldn't blink an eye. Us Brits, we'd talk about it, he's get a slap on the wrist but wouldn't be sacked.

It seems to be a uniquely American thing that the CEO can basically do anything (lie, cheat, fraud etc) just as long as he doesn't get caught with his pants down.

The second one was a direct report to him, and I wouldnt be surprised if he granted her favors in exchange for the sex (whether it was "promised" or not) typically no executive 'survives' having an affair with a direct report and stays in the company.

Who you have an affair with matters more, in this case a Chinese spy wasn't enough, which almost makes you think, he was not the only one at Nvidia who knew.

Yeah, it's the treason-y bit that the affairs revealed.