Neither Louise nor Martine Fokkens fit the stereotype of a window prostitute in Amsterdam. The majority of women working in the most notorious public brothel scene in Europe are young, conventionally attractive and from outside of Holland. The Fokkens are 70-year-old identical twins, and very Dutch.

Known as the "oldest window girls" in Amsterdam, Louise and Martine have almost 100 years' experience of prostitution between them. They have been the subject of a well-received film aptly named Meet the Fokkens and have written a book about their lives, due to be released later this month.