A glance at any movie guide reveals the bare facts. They rarely make nice pictures any more; nowadays it's all naughty films about naughty people doing naughty things. Who's to blame? ‘The public’ say the filmmakers. ‘These are the films they want and therefore these are the films we have to give them.' As John Pitman discovers, it’s a scene which saddens many people in the business. ‘Serious’ actresses find they have to strip if they want work, and writers and directors who would rather make family films must churn out titillation and terror. With the result that there are some surprising characters behind x-ploitation, including a university student reading English and a granny who use to write Mrs Dale's Diary