Gates had affairs with Russian prostitutes, and well after the end of the Cold War; not with Soviet IT businesswomen that might have been linked to the KGB.
And w.r.t. Brin vs. Huang, Rosenberg was a comparatively much lower ranked employee that didn't have a stratospheric carreer.
Google execs had affairs, I think Sergey Brin had an affair with an employee, again nothing happened.