I think there are two basic types of pooers. There are the doers and the thinkers.
Doers wait until the absolute last minute, duck in, push it out as hard and fast as they can, and then duck out. (They also tend to be more likely to spray air freshener, but that's another story.)
Thinkers take their time. They peacefully contemplate life for a while until nature ... eventually .. takes its course.
Readers are a subset of thinkers. And, I suspect, a fairly common one. Indeed, there is a whole genre of material precisely for reader pooers, including some anthologies edited by famed sci fi writer John Scalzi. Who among us, moreover, has not known someone who called the john the "library."
Apropos of which, comes this post from io9:
In 1979, Oh Dawn! Inc. released "The Amazing Spider-Man & the Incredible Hulk" in "The Gamma Gambit," a short comic printed entirely on toilet tissue.
Brilliant. Why didn't this catch on? (Did the ink rub off? That'd suck.) Granted, it'd be annoying if you shared a bathroom with somebody, since you'd miss chunks of story. But if you had your own private loo, you'd always have reading material at hand (so to speak).
Anyway, if "Uncle John" Scalzi decides to serialize, say, The Sagan Diary on Charmin, I want a finder's fee.