

In some areas like European beaches and among many indigenous populations across the world, cleavage exposure is acceptable conversely, even in the Western world it is often discouraged in daywear or in public spaces. In many cultures today, cleavage exposure is considered unwelcome or is banned legally.
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In several parts of the world, the advent of Christianity and Islam saw sharp decline in the amount of cleavage which was considered socially acceptable. Since at least the 15th century, women in the Western world have used their cleavage to flirt, attract, make gender statements, and assert power. This tendency has been attributed to many reasons, including evolutionary psychology, a patriarchal revolution, and dissociation from breastfeeding. In many cultures, though not all, men typically derive erotic pleasure from the visible display of cleavage. It is most commonly used in the parlance of Western female fashion to refer to necklines that reveal or emphasize décolletage (display of the upper breast area). The term was explained in Time magazine on August 5, 1946. film industry's Production Code Administration, coined the term in its current meaning when evaluating the 1943 film The Outlaw, starring Jane Russell. The superior portion of cleavage may be accentuated by clothing such as a low-cut neckline that exposes the division, and often the term is used to describe the low neckline itself, instead of the term décolletage.

Cleavage is the narrow depression or hollow between the breasts of a woman.
