To (Chapman To Man-chak), a long-time film producer, has yet to produce anything resembling a hit. Beset by financial troubles, he has become desperate for money - so much so that he is unable to pay the alimony to his ex-wife (Kristal Tin). Despite his former spouse's bitterness, their daughter still clings onto her faith in him - and wishes to see him on TV once his new movie premieres. To is soon introduced to a potential Mainland Chinese investor, Tyrannosaurus (Ronald Cheng), by his buddy Lui Wing-shing (Simon Loui Yu-yeung). But Tyrannosaurus is not only the head of a Guangxi triad gang, he turns out to have very particular tastes in food and sex. Regardless, To is determined to woo this investor, even if it means giving into his every demands. Tyrannosaurus eventually tells them to cast his childhood idol Yum Yum Shaw (Susan Shaw) in a remake of a classic pornographic film. He even gives the film the title Confessions of Two Concubines. After receiving funding from Tyrannosaurus, To then successfully casts the sexagenarian Shaw to act in Confessions of Two Concubines, with pseudo-model Tsui Ka-yan (Dada Chan), famous for her oral skills, acting as Shaw's younger body double. He also casts Hiro Hayama (Hiro Hayama), who is currently suffering from an incurable phobia after starring in his last erotic film, to be the lead actor. Things begin to turn awry when director Blackie Tak (Matt Chow) makes unreasonable changes to the original script, which results in the production going seriously over budget. Even more bizarrely, Tyrannosaurus makes a special request to have his girlfriend play a role in the film. But his girlfriend is no ordinary gal, thus resulting in plenty of madcap mayhem as everything soon goes out of control... As a last-ditch attempt to save the film, and also to fulfil his daughter's wish, To plans to publicly confess all the weird, outrageous and vulgar practices that went into the process of making Confessions of Two Concubines.