Sid Boggle (Sid James) and his friend Bernie Lugg (Bernard Bresslaw) are partners in a plumbing business. They take their girlfriends, prudish Joan Fussey (Joan Sims) and meek Anthea Meeks (Dilys Laye), to the cinema to see a film about a Naturism camp called Paradise. Sid has the idea of the group holidaying there, reasoning that in that environment their heretofore chaste girlfriends will relax their strict moral standards. Sid easily gains Bernie's co-operation in the scheme, which they attempt to keep secret from the girls.