Although fairly inauspicious upon initial release, "Relax" finally reached number one on the UK singles chart on 22 January 1984, ultimately becoming one of the most controversial and most commercially successful records of the decade. The single eventually sold a reported 2 million copies in the UK alone, making it the seventh best-selling single in the UK Singles Chart's history. Following the release of the group's second single, "Two Tribes", "Relax" rallied from a declining UK chart position during June 1984 to climb back up the UK charts and re-attain number-two spot behind "Two Tribes" at number one, representing simultaneous chart success by a single act, unprecedented since the early 1960s.
Upon release in the United States in late 1984, "Relax" repeated its slow UK progress, reaching number 67 upon initial release, but eventually reaching number 10 in March 1985.
The song won Best British Single at the 1985 Brit Awards.
The song featured on the soundtrack to T2 Trainspotting and also in the game Grand Theft Auto: Vice City Stories in the fictional in game radio station Wave 103
The first official video for "Relax", directed by Bernard Rose and set in a S&M themed gay nightclub, featuring the bandmembers accosted by buff leathermen, a glamorous drag queen, and an obese admirer dressed up as a Roman emperor, was allegedly banned by MTV and the BBC, prompting the recording of a second video, directed by Godley and Creme in early 1984, featuring the group performing with the help of laser beams. However, after the second video was made the song was banned completely by the BBC, meaning that neither video was ever broadcast on any BBC music programmes.
A live performance video of the song was directed by David Mallet, making the rounds at MTV.
Another MTV video of the studio version includes footage from the Brian De Palma film Body Double. Body Double, a popular 1984 erotic thriller film, contains a film within a film sequence in which Frankie Goes to Hollywood performs Relax on the set of a porn film.
