In The Sex Files Nigel Cawthorne takes us on a stroll through the ideas that made our (great, great) grandparents turn red. Selecting the highlights from what was deemed too corrupting for public comsumption, he demonstrates what made Edwardian, Victorian and Georgian prudes squirm. We find things that range from the pornographic to the ridiculous, including: Flagellation (for 50 shades fans) Ecclesiastical erotica The Trial of…