Written by the group's lead singer Holly Johnson, bassist Mark O'Toole and drummer Peter Gill, "Relax" was the first Frankie Goes to Hollywood single, and by far their biggest American hit (they had two other chart-toppers in their native UK: "Two Tribes" and "The Power Of Love").

The basic idea of "relax, don't do it" came to Johnson one day in winter 1982 when he was late for rehearsals "walking very quickly along the central reservation of Princes Avenue in Toxteth." At that point, the band only consisted of Johnson, O'Toole and Gill.

The lyrics are relatively ambiguous, although the line "When you want to come" is clearly a reference to orgasm. To throw censors off the scent, when "Relax" first came out the band claimed publicly that it was written about "motivation." Later they confessed it was actually about "shagging."

In America, any sexual innuendo contained in this song got little attention, but it caused plenty of controversy in England. On January 11, 1984, BBC Radio 1 DJ Mike Read announced on air that he refused to air "Relax" because of the single's controversial artwork and lyrics. Read was unaware of it at the time, but Radio 1 was already planning to ban the single, and did so shortly afterward. However, the ban was only temporary. A parody of Read's on-air rant was included on some of the releases of the band's third single "The Power Of Love."

The song had already reached #6 on the UK singles chart before the rant and ensuing kerfuffle, which helped propel the song to the top spot (commercial radio stations in the UK played the song more after the ban, boasting that they were playing "the song that BBC banned"). An appearance on the television show Top Of The Pops had moved the song up to #6 from its previous position of #35.

The BBC lifted its ban at the end of 1984 to allow the band to perform the song on the Christmas edition of Top of the Pops.

Originally when questioned on the matter, the press was told that the line that sounds something like "When you want to suck to it" was really "When you want to sock it to it." Later, once the song was successful, Holly Johnson confessed the line is "When you wanna suck it, chew it."

In 1984, "Relax" initially spent 48 weeks on the UK Singles Chart with five of those weeks consecutively in the #1 spot. When the band's second single "Two Tribes" was released in the summer of 1984, that song climbed to #1 while simultaneously "Relax" rose back up to #2. This was a feat only previously accomplished by Elvis Presley, The Beatles and John Lennon. After 48 weeks, the song fell off of the chart, but re-appeared soon after for 4 more weeks, giving it a total of 52 weeks on the chart.

Three music videos were made for this song. The first depicted the band in a Roman Empire bondage fantasy featuring simulated sodomy, Paul Rutherford's bare bottom and a group of bondage fetishists chained to scaffolding. It was banned by both MTV and the BBC. The second video, shown primarily in the UK, featured the band (pretending to) perform the song while standing in front of green laserlight. The third video, shown primarily in the US, featured the band in a live performance setting (performing along to the studio track) while being kissed and hugged by adoring concertgoers.

This was produced by Trevor Horn, a former member of the bands Yes, The Buggles and Art Of Noise. When this song hit #1 in the UK the week of January 28, 1984, "Owner Of A Lonely Heart" by Yes was at #1 in the United States. Horn produced that song as well, making him the only producer to score simultaneous #1s in the UK and US with songs by different artists. Other acts Horn produced include ABC, Godley & Creme, Paul McCartney, Seal, Simple Minds, Lisa Stansfield, Rod Stewart and Tatu.

When "Relax" was first released in the US in the spring of 1984, it peaked at #67 on the Billboard Hot 100. However, when the single was re-released alongside its album Welcome To The Pleasuredome in 1985, it reached #10.

The release of "Relax" was promoted by a variety of widely distributed T-shirts bearing the legendary "Frankie Say..." quotes, such as "Frankie Say RELAX Don't Do It."

This shirt gets a cameo in a season 3 episode of the TV series Friends during a scene where Ross (David Schwimmer) is taking back his stuff from Rachel (Jennifer Aniston) after the break up. Knowing she likes to sleep in the shirt, he asks for it back, even though it hasn't fit him since was 15. He puts on the way-too-tight T-shirt and declares, "I'm going to take the rest of my stuff and relax in my favorite shirt." He later returns the shirt in a sign of reconciliation.

Trevor Horn discovered Frankie Goes To Hollywood shortly after creating his record company ZTT when he saw the band performing "Relax" and "Two Tribes" on a Channel 4 show called The Tube. Chris Squire (of the band Yes) commented, "This band looks really interesting. Why don't you sign them up?" Horn didn't think much about them until months later when he heard them again on BBC Radio 1 DJ David Jensen's radio show. When Horn contacted them to sign them, he was unaware that the band was on the brink of breaking up because they felt unsuccessful.

Producer Trevor Horn recorded Frankie Goes To Hollywood performing this song in his studio but was dissatisfied with the outcome. He recorded a second version of the song using musicians from Ian Dury's backing band The Blockheads, but didn't like that recording either. He recorded a third version with producer/engineer Steve Lipson, keyboard player Andy Richards and Fairlight synthesizer programmer JJ Jeczalik, then informed a surprised Holly Johnson and Steve Lipson that he wanted to start from scratch a fourth time, using a beat he had once made on a Linn 2 drum machine. He added a programmed bass line, Lipson on guitar, Richards on keyboard and Jeczalik making "funny noises" on the Fairlight synthesizer to create what would become the fourth and official recording. Richards & Lipson added sound effects with a few different Roland synthesizers and Johnson & Rutherford added vocals to complete the track.

The record company's ad campaign for this song started with a quarter-page ad in the British music press featuring an image of backup singer/dancer Paul Rutherford in a sailor cap, accompanied by the phrase "ALL THE NICE BOYS LOVE SEA MEN" and declaring "Frankie Goes to Hollywood are coming ... making Duran Duran lick the s--t off their shoes."

It described the 7" and 12" vinyl singles of "Relax" as "Nineteen inches that must be taken always."

The band's first-ever studio venture resulted in a 1982 demo of "Relax" and "Two Tribes" for Arista Records, but the company chose not to go further with the band. "Relax" was also rejected by Phonogram Records, leaving them free to sign with Trevor Horn's ZTT.

Fellow New Wave artist Gary Numan once said of the song: "When I heard this it plunged me into a pit of despair. The production was so good, the sounds so classy that it seemed to move the entire recording business up a gear - we were all left floundering, trying to catch up."

"Relax" was the only song on the album that was recorded on analog tape. The rest was recorded on a Sony F1 digital tape machine.

Holly Johnson once shared that Top Of The Pops presenter Paul Gambaccini "was amazed the record was being played. He said no one had got away with such obvious sexual innuendo since Lou Reed's 'Walk On The Wild Side'"

BBC Radio 1 DJ Mike Read once explained, "I didn't ban 'Relax.' I didn't have the power to ban it because I'm just an individual. What happened was that my producer went home one day to find his two young children messing around with the video recorder, rewinding and watching over and over again a clip from the 'Relax' video in which two men simulate buggery [a British term for anal sex]. And, not surprisingly, he was very upset."

This was used in the film Body Double, a 1984 suspense movie in which Holly Johnson, while lip-synching to the song, leads a man into a sex bar. The man eventually performs a sex scene as the song plays. This scene of the film virtually serves as a music video within the film. Backup singer/dancer Paul Rutherford also appears as a patron at the bar.

"Relax" was also featured in the 2001 Ben Stiller movie Zoolander.

In 1999, a man named R.D. Turner copyrighted the name Frankie Goes To Hollywood in the US and formed a band called The New Frankie Goes To Hollywood, which began playing shows in the US and abroad. Turner falsely claimed to be Davey Johnson, a brother of lead singer Holly Johnson. The band also sold new versions of the band's signature "Frankie Say" shirts for $20 each online.