People are more or less used to the idea of girls above 20 years old having the right to adopt any attitude they want. But younger girls are still facing a lot of contradictory orders : be cute, be tame, be pure, be glamour. Be prepared to your sexualized woman role in society, but stay innocent. Who said double-bind ?
Dancing girls show themselves as both sexy and foolish. They evidently like their own body, but they seems not to care about their social status. It somehow break the appearance rules that older girls respect.