Humdrum life from a broken marriage leads a bored husband to join a "Changing Partners Club". Humdrum life turns into one big happy sexual adventure for the newly rejuvenated husband. [Tai Seng Catalog] Taxi driver Lee Keung takes a fare for Szeto Tan. They drive to the country to watch a woman apparently being raped, but it is really Tan's wife Linda having an arranged screw. Tan invites Keung to join his "Happy Pal Club", a wife-swapping group. Members include psychotherapist Dr Poon with a infantile mother fetish, and his bonded mainlander nurse, whom he presents as his wife; Susan, who is one of Poon's patients; Susan's ex-husband Peter and his girlfriend Mary; Headmaster Wong and his wife; and wheelchair-bound Chui and his ageing wife.