 In 1976, Vainio was hired to write a number of bawdy songs which were later released on cassette tape. Vainio wrote a part of the songs and sang on the record with all musicians using pseudonyms, Vainio's being Junnu Kaihomieli. Many of the songs were based on a familiar melody whose copyright had already expired; for example, the song Kumi-Roope ("Rubber Roope") was an obscene version of the folk song Rosvo-Roope ("Roope the Robber"). In 1979 Vainio participated in another recording of similar songs. The songs were released on compact disc in 1992 and 1997 as Pahojen poikien lauluja 1 – 2 ("Bad Boys' Songs 1 – 2") and Porno-ooppera / Pahojen poikien lauluja 3 ("Porn Opera / Bad Boys' Songs 3"). Both records went gold.
