The term "secret vice" is often used to describe a behavior or habit that is kept hidden from others due to social stigmas or personal shame. There are a number of synonyms that can be used to describe this phenomenon, including "guilty pleasure," "taboo indulgence," "private habit," and "covert obsession." Other words that might be used to express this concept include "clandestine passion," "deep-seated desire," and "black addiction." These terms all convey a sense of something illicit or forbidden, something that people keep hidden due to fear of judgment or consequence. Despite their negative connotations, however, they can also convey a sense of intimacy and self-discovery.