It speaks to the level of seriousness with which they approached their fiduciary duties, would be my view.

Not necessarily illegal from what I understand; but it easily could contribute to a lawsuit for a hostile work environment, could anger investors, and could maybe cause a lawsuit for allowing the executives to be irresponsibly vulnerable to blackmail or rape allegations.

Besides professionalism, it's just plain stupid. What happens if a participant claims they were pressured into it for the sake of a promotion, or for the sake of not being fired, or for the sake of not losing their visa? The result would be a disaster. This is also so predictable, that maybe an investor could claim legal negligence.

Is there any evidence to say that they happened? The only thing I have seen is extrapolation from comments made online about polyamory. Is there a source citing specific events at specific locations?

I think the comment was hyperbole