I'm a film major and a romance novel junkie. I find with porn I just start critiquing the lighting, the camera movements, the editing (my field) and pretty much everything my classes have thought me to look for. Needless to say with thoughts in my head like, "They really should of cut about 5 sec off the shot," or "Hey that the exact same thing but from a different angle," I can fall out of the mood. As for my romance novel habit, there are some times when I have to take a break and fan my self. I think with books there's more left to the imagination, so you can insert any guy you want into the picture.