i wonder why more people haven't tried this?

"When accused of profaining the Eluesinian mysteries, she [Phyrne] was defended by the orator Hypereides, one of her lovers. When it seemed as if the verdict would be unfavorable, he rent her robe and displayed her lovely breasts, which so moved her judges that they acquitted her. According to others, she herself thus displayed her charms." (source)

or, as a.j. jacobs puts it:

"... I wonder if lawyers today could make this work. It could revolutionize the profession. 'Yes, my client poisoned her husband and chopped him into chunks the size of croutons and fed him to her Rottweiler. We admit that. But gentlemen of the jury: have you seen her rack?'"