Watching porn together?

Has anyone ever done this with their man? I know he watches porn... It doesn't totally bother me. I mean, I'd rather him watch porn than go elsewhere for sexual satisfaction. I have occasionally watched some porn myself. 
So, my questions are: Have you watched porn with your man? What do you do while watching it together (just sit and watch, touch each other, go at it, etc...) What type do you watch?