4th century Roman writer who discusses varieties of sexual orientation, including lesbianism.
This is an invaluable book that collects all manner of classical Greek and Roman texts relevant to homosexuality in a single volume. I doubt that it’s exhaustive, especially with regard to male homosexuality, but Hubbard seems to have made special efforts to include female-oriented material. The material is organized chronologically and by literary genre, with an introductory discussion in each section to provide historic context.
Medical references to sex between women include several on the “rediscovery of the clitoris” theme as well as pseudo-medical explanations for same-sex desire, plus some titillating orientalism. Several of the texts cited here are classical but formed part of the corpus of standard medical literature in the Renaissance.