Remember the old style bulletin boards back in the day? 4Chan is kinda like this, but features porn! The site is a little confusing to use, especially if you've never used this layout of bulletin board. The most recent posts/replies are near the top, and you'll see the odd thumbnail in some of these.
If you click on a thumbnail it enlarges it in the same window, so to continue to browse you'll need to scroll down. The photos are pretty random here. Most are of gorgeous girls, some dressed, some in bikinis and some nudity.
There are pages of posts to scroll through, but to be honest the amount of porn you get isn't really worth it. If you're into collection porn photos you'd be better off looking for a gallery site instead.