Are you talking about the same Rama sequels by Gentry Lee?

I admit it's been a long time since I read them (maybe 20 years), but I certainly don't remember anything quite like this. I remember it more like the other poster here said: they basically said everyone was corrupt. In a nutshell, Rama comes back to Earth with instructions that a bunch of humans need to come aboard to live out their lives there. But instead of sending their best, some parts of Earth send their worst: criminals and such. So pretty quickly there's several different "cities", with one of them basically run by some crime boss. One of the main characters' daughters gets involved with the crime boss somehow and murders him before killing herself, as payback for killing her father. Later, the human habitat goes to war with the aliens in one of the other habitats, because the humans had broken through to their side and invaded them for some reason I forget. There was even one plot point that the father had hacked into the ship's environmental controls because the humans insisted on having wood-burning fireplaces, even though this messed with the environmental control systems. Instead of just not burning fires, the basically forced him to change the system to accommodate their fireplaces.

But I don't remember any sex slaves. Maybe I forgot that part.

> “the first part talks about Hitler's invasion of Poland in a strategic sense and then everything else is about the affairs among the officers' wives or something”

Sounds like Tolstoy…