I'm going to fire someone because they refused to sleep with me
Why would you fire someone just because they won't sleep with you?
She's a fat ugly bitch who doesn't deserve a job.
Firing an employee who refused to sleep with you is a terrible idea! You shouldn't be sleeping with employees anyway. She could easily sue and win, and then you'd be in trouble.
But it is not fair if you can't sleep with everyone you want.
There is nothing about sleeping with whoever you want being fair. Sleeping with your employee is bad especially in the era of metoo, which could go badly for you.