London Massage Parlours

A London massage parlour is basically a whorehouse in London, that is a derogatory term, personally I find that term disrespectful, you can use other words, such as brothel, short time place etc.

Why do guys use massage parlours opposed to houses and hotels?

Most guys that frequent massage parlours fit into several types of categories, and most of them want a quick shag with no strings attached, they want a discrete sexual act with a beautiful lady.  A hotel is best for longer stays but it carries risk of being caught especially if the male customer (punter) is married, famous or has a family.  So a "brothel" is an ideal safety zone where you can do a one stop and drop and get back to your everyday life.

Those seeking establishments in London, perhaps live close, or it may be because they are seeking somewhere away from there city, and because london is so big, there are plenty of hide outs.