130 Days of Pseudopolis is a sex manual mentioned in the novel Pyramids. Ptraci comments on it when she sees a tattoo of one of the sex acts on the arm of Alfonz, who is one of the sailors on Chidders ship. The title is a reference to the Roundworld book by the Marquis de Sade's 120 Days of Sodom, in which the positions are not completely physically impossible (like the one mention from 130 Days of Pseudopolis), but would involve a great deal of physical discomfort at the very least, and excruciating physical pain at the very worst. De Sade builds his unique personal philosophy in which he defines a basic human right to do anything he damn well likes to anyone he damn well chooses - allowing them only the right to become a sadist to others in their own turn (should they survive). As the book defines a sort of Fascist philosophy of human sexuality, this was filmed by Pasolini as a satire on the last days of Mussolini's Italy.