House prostitution is a term used to describe a form of prostitution where sex workers operate from a specific location or venue. Oftentimes, these locations may be disguised as brothels or massage parlors. However, there are numerous synonyms for house prostitution which enable the sex industry to operate underground. These include terms such as "massage parlor", "gentleman's club", "escort agency", "sex den", "red-light district", "hooker hotel", "whorehouse", and "brothel". The use of such alternative names for house prostitution is often indicative of efforts to hide or disguise the true nature of the activity taking place.