What metaphors are used in The Robots of Dawn by Isaac Asimov?

Sex is not discussed even by women in the Personals (public bathrooms), where everything is discussed on Earth, and such books as are available—published off-planet—are heavily metaphorical. Gladia goes onto talk about these metaphorical books about sex on Solaria, and the prohibition about discussing sexual matters. She has learned the mechanics. Baley is uncomfortable with the discussion, but presses his questioning out of duty. He insists that if touching him makes her think in terms of orgasm, she must at some point have experienced one, in order to have a point of reference. Her mourning, partly expressed in the inability to look at Daneel because of the physical resemblance to Jander suggests to Baley that they had been lovers. Gladia announces firmly that it is deeper than that: Jander had been her husband.