Book by its cover

You really shouldn’t judge a book by its cover, the saying goes. But if a book is covered with wickedly sharp spikes, you should consider buying the Kindle version.
The same goes for books that have a cover that is on fire, although most bookstores won’t stock books that are on fire. And Amazon can’t deliver them fast enough. You’ll end up with a box of ashes.
As for the book that’s dripping with semen, well, that’s just plain gross. But then, maybe you should get it.
I mean, someone else enjoyed it, right?
Just wipe it off first, okay?