Let me see if I can explain what I was talking about.
Take the workplace out of it for a second. If I go to a bar and ask a woman to go to bed with me, it's not against the law, correct? Thus, the idea of one person asking another for sex is not illegal. Now, keeping in mind the concept of this thread, if a male boss suggests to his female employee a sexual encounter, and she turns him down, the female has done nothing illegal, but HAS made a moral choice to refuse sex. Is it okay for her to make such a moral choice and be fired for it because the boss is mad, embarrassed, controlling, etc.?
I think we both agree if an employer told an employee to rob a bank or lose their job, this should not be allowed. In that case, the employee is being asked to do something illegal, and you amended your position to say employees should not be able to be fired for refusing to break the law. But refusing sex (or asking for it) is not against the law, but it IS a moral (and sometimes religious decision). Are you okay with the idea of an employee being terminated for making a moral decision to not engage in sexual activity with their boss?
The threadstarter said "any reason they wish"...I would assume it isn't limited to union protection, discrimination and the like. Any reason they wish would mean unadulterated power over hiring and firing.