You might want to read this review

A book on Genesis 1 - What really happened in the Garden of Eden?

From inside:

The translation “rib” is discarded, as Zevit indicates that that was not even considered as one of the options by the early rabbis. His suggestion is that the limb/appendage referred to is the baculum—the bone that other species have in the penis but is absent in human beings (137–50).

I've requested a review copy - not holding my breath.