Polanski was initially charged with rape by use of drugs, perversion, sodomy, lewd and lascivious act upon a child under 14, and furnishing a controlled substance (methaqualone) to a minor. These charges were dismissed under the terms of his plea bargain, and he pleaded guilty to the lesser charge of engaging in unlawful sexual intercourse with a minor.[39]

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This what he was charged with and cut a deal to save him jail time.....

Pretty simple.....