Songfacts®:

• According to Robbie Williams, this song is written from the perspective of "a seedy old bloke." It appears to depict a one-night stand, with Williams acknowledging it's a sinful act, but desiring the casual sex regardless: "Don't let your eyes tell the brain you should feel ashamed. Everyone needs it, baby, and I feel the same."
• This was the first song Williams wrote with Stephen Duffy after splitting with his former collaborator, Guy Chambers. Chambers helped Williams write some of his biggest hits, including "Angels," "Let Me Entertain You," and "Feel," but the pair fell out during the making of Escapology. Williams subsequently started writing with Duffy, who was a former member of both Duran Duran and The Lilac Time. Duffy later said of "Sin Sin Sin": "As soon as we'd completed this track, I thought we might just have a future together." British author Chris Heath, who spent two years working with Williams on his biography Feel, is also credited as a songwriter on the track.
• The single version of "Sin Sin Sin" has a different production than the album original. The instrumentation is more upbeat on the single version, with the additional drums lending the song a poppier sound fit for radio.
• Directed by Vaughan Arnell, the music video for "Sin Sin Sin" was shot in Cape Town, South Africa a few days before Williams was due to begin his tour there. The video sees Williams transforming into the leader of a pagan cult, with the British singer doted on by a following of pregnant women.
• "Sin Sin Sin" was the final single released from Williams' sixth album Intensive Care, after "Tripping"/"Make Me Pure" and "Advertising Space." It was the first Robbie Williams single that didn't place in the UK Top 20, peaking at #22.