I've never worked at any company that used them or heard about them. Instead we take yearly training saying that even flirting with the idea is a cause for immediate termination.

Your companies had zero tolerance for consensual relationships at the office? Not even married couples? Possible, but the exception because that really constrains your talent base.

Good idea about stats. Please share what you find.

Do you suppose Jensen had a love contract with his subordinate, when the breaking of the news of their extramarital relationship led to a 20% drop in stock and the removal of Jensen as CEO?

You're asking a leading question with flawed premises and assumptions.

1. The subordinate story broke yesterday. The stock dropped 12% (not 20) and recovered half.

2. But for the spy/export control subversion, do you think a CEO would be stepping down for banging a co-worker? LOL...