This study takes place after the gregorian reform of the eleventh century wich strives to make the chastity respect necessary for all the clergyman. In the acceptation of that continence, several itineraries appear to take into account the emasculated clerks. The revengeful secular castration and the religious enthusiasmic self-emasculation, help us to take a closer look at the twelth to fifteenth century clerks'sexual desire. However certain amont of this emasculations do not involve carnal torments and each clerck has to warn the papacy about this irregular situation. Those different applications for dispensation addressed to the pontifical chancellery allow us to interrogate the notion of " third gender " and to put into perspective the established rules of the Roman Church as for these exeptional applications.