By Silvia García Dauder and Nuria Gregori [Eurozine] Truths and binary oppositions in the construction of sexes-genders-sexualities. The controversy around the gender of the South African athlete Caster Semenya is by no means unprecedented. As Nuria Gregori and Silvia Garcia Dauder write, the world of sport is a social microcosm that reveals much about the role of assumptions concerning biological sex in a psychosocial logic in which gender identity, sexual orientation or s