Stefani had an emotional breakdown from difficulties collaborating with many other artists and songwriters, so No Doubt bassist Tony Kanal invited her to his house. Kanal had been working on a track, which later became "Crash", the sixth single from the album. However, the two were unable to write anything following that, because they had differing ideas of how the music should sound. Stefani commented that "[i]t was just frustrating and embarrassing to sit there and think we could write songs." Six months later, the two returned to work and came up with the beginnings of a song while working in Kanal's bedroom. The two experimented with combining various melodies and including what Stefani referred to as "this really kinda fast rappy part". This was the last song she and Kanal wrote together for the album.
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The R&B-inspired song samples The Isley Brothers' "Between the Sheets".
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After Stefani and Kanal finished writing "Luxurious", they visited record producer Nellee Hooper, who suggested a sample of The Isley Brothers' "Between the Sheets". The song had previously been sampled in several songs such as Da Brat's "Funkdafied", Jim Jones' "Summer wit Miami", The Notorious B.I.G.'s "Big Poppa", and Whitney Houston's "One of Those Days". Stefani was reluctant to use the sample because it would mean losing some of the publishing rights to the song. Nevertheless, she decided to use it because "it sounded so amazing and meant to be".