Having a relationship with someone you have authority over is considered very problematic just about everywhere, in part because the existence of that authority creates problems for consent (among other reasons).

You don't have "authority" over somebody just because you're their boss at work. Only in the military.

Do all of you corporate people also let your employer tell you what you're allowed to eat and drink? Or tell you where you're allowed to be when not on the clock? Maybe tell you what movies you're allowed to go see in the cinema?

Somebody who lets other people take agency over their sexuality or other basic human functions cannot be considered fully human. Why would you trade away that?

They can in fact put in the contract that you aren't allowed to drink a glass of water.

Your remedy for that problem is not to accept that job or to refuse to sign the contract and negotiate.

It is for that reason that no job in the US has that term.

And that's why you wouldn't sign a contract limiting your most basic human dignity of freely choosing romantic partners - unless you are willing to sell out your human dignity and become less than fully human.