Twin sisters who claim to be Amsterdam’s oldest prostitutes have retired after more than 50 years each in the business. Louise and Martine Fokkens, 70, have decided they are too old after bedding a total of 355,000 men. Mum-of-four Louise, says arthritis now makes some sexual positions “too painful”. And Martine, who has three children, admits she finds it hard to attract punters – though one elderly man still has his weekly sadomasochism session.