I remember most the longest essay here, 'Mephistopheles and the Androgyne', and it is a very interesting study of the cosmological problem of the reconciliation of opposites, but like most of Eliade's works, since he lacks, or at least does not mention, a transcendent reference point, it is not as clear or as interesting as the metaphysical perspective. Recommended for the large quantity of examples from ancient texts, but for a much more profound and interesting study, see Julius Evola's The Metaphysics of Sex.