The Deathworms of Kratos

I read the entire book, but this is one of the few I would have to rate one star.
There's seven characters in the book - but only three are even important, the other four exist just because the author wanted to pair some people together for sex.
The MC woman's back story is full of rape - and one of the other MC is a rapist? I know this is from 1975, but there are a lot better ways to make someone have a painful backstory besides “and then she was raped by 50 people”.
Also the plot was kind of boring and has a pretty anti-climatic ending- things I would consider fun got explained away when the main POV character is in a coma.