This question refers to the novel Hound of the Baskervilles by Arthur Conan Doyle.
There are several details in this novel that suggest that Holmes is a sensualist and a man of the world. For example, Holmes is very fond of smoking a pipe. He engages in this habit because it causes him quite a bit of pleasure. The same can be said about his occasional use of drugs. Moreover, Holmes appears to be cultured, as he plays the violin and has a great knowledge of history and geography.