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When faced with indecency issues back in the 1930s, W.G. Cassidy explained in an essay titled Private Parts: A Judicial View that it may come under "other private parts" in Australian Law, though indecency generally covers the genital area.
In the early 2000s it became fashionable for young women and men to expose their buttocks this way, often in tandem with low rise jeans. The Cincinnati Enquirer called it the "new cleavage", and expressed views that "It's virtually impossible to find jeans to cover your hipbone". In August 2001, The Sun celebrated a "bum cleavage week" claiming that "bums are the new tits". In reaction to this trend, Saturday Night Live aired a parody advertisement in their April 16, 2006 episode for a product called Neutrogena Coin Slot Cream, in which host Lindsay Lohan appeared.
British designer Alexander McQueen was particularly mentioned as the originator of buttock cleavage-revealing jeans, known as the "bumster", in cultural critique Sheila Jeffreys' Beauty and Misogyny: Harmful Cultural Practices in the West. United States Patent 6473908 registers a design for buttock cleavage-revealing trouser designs. In the mid-2000s, Good Morning America reported on a rise of popularity of the buttock cleavage among celebrities.
The terms plumber butt (Canadian, Australian and American English) and builder's bum (British English) refer to the exposure of male buttock cleavage, especially on occasions of careless bending over. Also plumber's crack is used in some parts of Australia. The expression "builder's bum" was first recorded in 1988. The terms are based on the popular impression that these professions are particularly prone to this kind of mishap.
In the Netherlands the term bouwvakkersdecolleté and in Germany Maurerdekolleté is used, which can be translated as "builder's/masoner's cleavage".