 Bentham tended to think of pleasure and pain as a kind of sensation, as the notion of intensity might suggest. One problem with this kind of hedonism, it has often been claimed, is that there does not appear to be a single common strand of pleasantness running through all the different experiences people enjoy, such as eating hamburgers, reading Shakespeare, or playing water polo. Rather, it seems, there are certain experiences we want to continue, and we might be prepared to call these—for philosophical purposes—pleasures (even though some of them, such as diving in a very deep and narrow cave, for example, would not normally be described as pleasurable).