It's a huge deal for underlings who have to obey their masters. It's not a huge deal for masters who make the rules.
If you allow your employer to control your sexuality you are not fully human.
Sleeping with your subordinates opens the company to lawsuits. Which is bad for business.
This is just a weird and IMO slightly creepy thing to say. Office affairs are ripe for power abuse and corruption. It’s not about sexuality.
It's a huge deal regardless. You'll be fired even as a CEO. As the above comment states, CEOs of Nestle, McDonalds, Intel have fallen once these things were uncovered. It's basically an express ticket to getting fired.