forgive me father

Before you ask, yes there are paintings of this. And yes, they’re amazing.

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The courtesan named was named Phryne and she was indeed a renowned beauty, and was indeed was put on trial for a capital crime. And yes, the sum of her defense consisted of her stripping in court (helped by her lover/defendant) and asking the jury (all males) if they were prepared to destroy this. 

But this is actually a very interesting case of Values Dissonance - the capital crime she was accused of was blasphemy. In Ancient Greek society, exceptional beauty was a sign of favor from the gods, and they took the idea that beauty indicated goodness with great seriousness. They even called their nobles Kaloi k'Agathoi, “the Beautiful and the Good.” 

So by showing off her great physical beauty, Phryne was being very clever indeed, her argument essentially being “How could I possibly commit blasphemy if the gods have given me this body?“