The films face a backlash from morality campaigner Mary Whitehouse, and the arrival of home video marks the end of an era for the great British sex comedy.
Trouser-dropping Robin Asquith reveals how Confessions of a Window Cleaner became the hit British movie of 1974, making his backside the most famous in British history
Saucy! reveals how 1970s British sex comedies put boobs on screen and bums on seats, and examines the industry's unsavoury side