Alvin Rides Again is a 1974 Australian sexcomedy film sequel to Alvin Purple. It was directed by David Bilcock and Robin Copping, who were regular collaborators with Tim Burstall. It was rated M unlike its predecessor which was rated R. Alvin Rides Again still features a lot of full frontal nudity.
Tim Burstall said neither he, Alan Hopgood or Graeme Blundell were particularly interested in making a sequel to Alvin Purple but the film was so successful, Hexagon Productions wanted a follow up. Blundell wanted to avoid being typecast so a story was created which gave him a chance to play a double role. Burstall, who claims he wrote most of the script with Al Finney, says thatWhen it came to the crunch, Blundell failed to differentiate between paying Balls and playing Alvin pretending to be Balls. In my view, the film fails for precisely that reason, i.e. Alvin is lost. ........
Source: Wikipedia