Abstract: Eugène Wilhelm, a jurist from Alsace (1866-1951), kept a diary continuously from the age of nineteen. His laborious entrance into the cycle of sexuality, characterised by the ambivalence of his desires, is described in the first volumes of his diary, and is the subject of this article. Analysing this process throws light on the genesis of the cycle of masculine sexuality, the construction of bisexual identity, and the concrete shape which the social enforcement of heterosexuality took at the end of the nineteenth century.
