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Cleavage is the cleft created by the partial exposure of a woman's breasts, especially when exposed by low-cut clothing. The neckline of a garment that exposes cleavage is known as décolletage (or décolleté in current French). Intermammary sulcus or intermammary cleft are the terms adopted by the International Federation of Associations of Anatomists for the area of cleavage between the breasts not including the breasts. Exposure of the underside of the breast, such as below an extremely short crop top, is known as neathage[1], reverse cleavage[2] or underboob[3], or Australian cleavage[4] (because the down under side of the breast is exposed). When the lateral aspects of the breasts are uncovered, it is known as side cleavage or sideboob.

Theories of cleavage

Some evolutionary psychologists theorize that humans' permanently enlarged breasts, in contrast to other primates' breasts that only enlarge during ovulation, allowed females to "solicit male attention and investment even when they are not really fertile."[5] Popular British zoologist and ethologist Desmond Morris theorizes that cleavage is a sexual signal that imitates the image of the cleft between the buttocks[6], which according to The Naked Ape is also unique to humans, other apes as a rule having much flatter buttocks. However it is worth noting that, as far as is known, humans have never had breasts that would have much cleavage even when they are unclothed, so breast cleavage is a phenomenon of modern, clothed humans.

Cleavage variant illustrations

Haley Crush’s Australian cleavage
Tiffany Taylor’s Australian cleavage hair bra
Lucy Pinder’s sideboob cleavage

See also

External links


  1. Urban Dictionary: Neathage
  2. Urban Dictionary: Reverse cleavage
  3. Urban Dictionary: Underboob
  4. Urban Dictionary: Australian cleavage
  5. Charles B. Crawford & Dennis Krebs (eds.), "How Mate Choice Shaped Human Nature", Handbook of Evolutionary Psychology: Ideas, Issues, and Applications, Lawrence Erlbaum Associates (1998).

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