Some human beings refuse to take the path that leads from being male to becoming a man or from being female and becoming a woman and want to belong to the sex for which their bodies were not designed -and this at any price. In our culture, these transsexuals want to both occupy the other place in the network of symbolic exchanges and have a mark of this change in their bodies. Their sadness is irremediable, for although they can change their social sex, they cannot change their bodily sex. "It's better " states one transsexual, "to change what's in the mind". Will we succeed in doing so ? A university professor, Colette Chiland taught psychology and psychopathology of children and adolescents, then clinical psychology at the Sorbonne University in Paris.