I passed my calc course because I smashed the professor
That's a pretty big responsibility. What made you have sex with your professor?
The professor was a cute guy and I liked him a lot
I'm happy you had a good time with him.  However, it was wrong of him and a serious dereliction of his duty to sleep with a student like that.  He could end up getting himself fired if you two continue.
He's a smart guy, he knows what he's doing. Plus, he cheated on his wife for me.
You two were supposed to have a professional relationship, so it wasn't right to potentially jeopardize his career for this. How would he feel if he actually lost his job from this?