Her skin color is repeatedly fetishized--which, okay, maybe this is the sex-hungry narrator's bent.
The cringe-worthy part involves the character of Benny, who AM mutated into a primate creature with enlarged sexual organs. The narrator takes great pains to point out that Ellen obligingly has sex with all of the crew (ehh....), but she really likes having sex with Benny.
Again, I understand this is unreliable narrator's jealousy probably seeping in, but a book written today might be a little more conscious about the optics of the black female character having sex with a Simian/human hybrid.
EDIT: Since I happened to have the ebook on my laptop, here's the passage in question:
> It was too late. None of us wanted to be near him when whatever was going to happen, happened. And besides, we all saw through her concern. When AM had altered Benny, during the machine’s utterly irrational, hysterical phase, it was not merely Benny’s face the computer had made like a giant ape’s. He was big in the privates, she loved that! She serviced us, as a matter of course, but she loved it from him. Oh Ellen, pedestal Ellen, pristine-pure Ellen, oh Ellen the clean! Scum filth.