"All Day I Dream About Sex" is a song written and recorded by American rock band Korn for their second studio album, Life Is Peachy. It was released as the album's second single in March 1997. The title is an acronym for the statement “All Day I Dream About Sex” and does not refer directly to the popular sportswear brand, Adidas, although Korn was known for frequently wearing the sport brand back in their early years. The whimsical backronym from the brand name dates to the 1970s.

The song was played at to a crowd of 275,000. The song was a staple of the band's live setlist up until about 2007, when it started to be played far less frequently.

"All Day I Dream About Sex" is the only official video from Life Is Peachy. It was directed by director Joseph Kahn. The plot revolves around a car accident which causes the death of all Korn members at the hands of a pimp and his prostitutes. The police officers and fire fighters and paramedics secure the crash site and the corpses are placed in black body bags, where they appear to come alive and move violently. After that, they are transported to a grotesque morgue where a pathologist examines their corpses. When the band members are undressed, it is revealed that singer Jonathan Davis is wearing girls' underwear. This is the only video where singer Jonathan Davis can be seen wearing one of his customized sequined Adidas tracksuits. The radio mix of "A.D.I.D.A.S." is used for the video.

The song's title is also a kind of tribute to German sports apparel manufacturer Adidas, which was a favorite of the band in their early years. In 1998, Korn took up a six-figure endorsement deal with rival Puma.

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