Rock is talking to this young girl, and listening to her singing. In doing this, he hopes that she has a shred of humanity left in her, and so he treats her as such.
This is the first time she has ever been treated as if she were a human, and offers to reward Rock the only way she knows how, with sex.
Rock then loses all hope in her humanity, and storms off.
She is a full female. Whether she's mangled or not is irrelevant.