To me, it is all about intent. Am I searching out things to be visually stimulated, or is it incidental? I think searching out things to be visually stimulated by is wrong, no matter the level of undress. It would be the same for anything, not just the Internet. If I am at a store, and see a scantily clad woman while I am picking up a gallon of milk, that is different than if I were to go to a strip club, or even a bar, to look at scantily clad women. It doesn't have anything to do with a certain number of times per year or anything like that.