n the digital age, more of us are watching porn than ever before - but what are the lessons it's teaching us? This More4 exclusive, takes a tongue-in-cheek look at the rules of dating, romance and sexual attraction as revealed by the analysis of the 100 greatest porn films of all time. What's the best chat-up line? What job is most likely to get you some carnal action? What's the sexiest haircut, and who has more fun, blondes or brunettes? These and other burning questions are answered by presenter Grace Dent, with interviews from porn stars, directors, comedians and members of the pubic, mixed with porn's funniest and most iconic archive moments