If you are afraid that reading your books will damage the covers, you can cover them. This online store sells “Book Sox”. They are made of stretchable fabric and they come in loads of different styles and colours. Be careful putting them on! If you are not careful you might break the back of your paperback. If you would like one, check Ebay first. There are a lot of Book Sox available there.
Thanks to Mozette for telling me about this.