It's not. That's a strange statement to make, particularly the emphasis on "married". It seems that person is implying that if a married woman participated in the affair, it was due to coercion. A sexual harassment lawsuit would mainly be a liability in the court of public opinion.
For someone not familiar with American law: How the fuck is that a bigger problem than the Chinese spy ?
Is there any explicit rules at NVidia forbidding that in a code of conduct somewhere ?