I have found one academic study which summarises research looking at the relationship between ornament size and personality (Steiner, 1980). It notes two key studies, both unpublished conference presentations by the American psychologist Nancy Hirshberg (1937-1979), who unfortunately seems to have been taken very young, and her colleagues. In these studies, the 144 subjects were female students at the University of Illinois. Large breast size was found to be significantly positively correlated with being ‘undersocialized’ (that is, antisocial), undependable, impulsive, ‘psychologically minded’
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