But Saletan still gets it wrong.

This girl's testimony makes it clear she definitely did NOT want to do...what was done. Polanski used:

1. Drugs and alcohol
2. A LOT of relentless insistence
3. AND, the confusion, and tendency to submit to adults, of a 13 year old kid.

And while the age of physical sexual development has been decreasing lately, there's no evidence that literal maturity, as signified by brain development, has also begun to develop earlier.

The conditions may or may not satisfy requirements for a rape of an adult--it could be said that a an adult victim would have been expected to be clearer about the refusal. But that clarity of refusal might easily be expected to be absent or ambiguous in a 13 year old girl, drugged, and in a situation of being under "adult guidance" by the perpetrator himself.