It's not about whether or not they were coerced, it's about the complications that it brings to the table. Has anyone he was sleeping with been promoted? Did the fact that they were sleeping with him compromise the validity of that process? Is he vulnerable to current or previous sexual partners (coercion goes both ways)? Is he vulnerable to people who weren't sleeping with him but knew about his affairs?

Remember, this a guy who shepherds a multitrillion dollar company. He needs to be able to demonstrate good judgement, and that generally means not screwing the crew, or Chinese spies.