As this article points out, historians of sexuality put a lot of weight on the depiction of women-loving-women in Lucian's Dialogues of the Courtesans #5, simply because of the scarcity of references to female homoeroticism in the classical era. But Lucian's fictional episode can't be read as a realistic description of anything and must be interpreted through multiple layers of context, symbolism, and cross-reference. These can make it even more valuable as a piece of data, but much more difficult to read as a mirror of historic f/f sexuality.