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In page Prostitution in ancient Greece:

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The prostitutes are obviously considered to be unfair competition. In a different genre, Plato, in the Republic, proscribed Corinthian prostitutes in the same way as Attican pastries, both being accused of introducing luxury and discord into the ideal city. The cynic Crates of Thebes, (cited by Diodorus Siculus, II, 55–60) during the Hellenistic period describes a utopian city where, following the example of Plato, prostitution is also banished.[citation needed]