I watch it probably around 4 days a week, give or take. Left hand for pictures (too much clicking involved), right hand for videos. Favourite stars: Amia Moretti, Tia Tanaka, Tanner Mayes, Sasha Grey (more for an entertaining performance than anything).
The only problem I can see arising from watching porn too often is that your standards for women could get too high since you choose the perfect chick to fap to every time, and its not like you get to choose the perfect woman to fuck every time. Unless you are Rick James, James Bond or Chuck Norris.