I'm turning into a major ass fiend when I jack off now. I always find myself now playing with my asshole as I stroke my cock.
I've used my fingers, a banana ( and as others have posted, they don't work very well) but last night I tried a cucumber. It hurt going in (need more lube I think) but after I pulled it out it was a huge turn on to put my fingers down there and feel my gaping asshole. I'm so doing this again today.