I have attempted to make some contribution to the treatment of perversions by bringing material from the analysis of a patient with a rubber fetish. I have tried to show how, behind apparently passive behaviour, it was possible to discover the acting out of sadomasochistic behaviour and a hidden erotization of the transference, and from this to establish some important aspects of the patient's psychopathology. I have stressed especially the splitting and projective identification of sexual excitement, aimed not only to rid the patient of excitement which was too much fused with sadism, but particularly aimed at the destruction of calm and strength in his object, as an analytic feeding breast. This was associated with extreme passivity in his personality and relative impotence in his sexual life. His perversion affected his relationships with his external and internal objects, as well as his sense of truth and guilt, and could only begin to be satisfactorily helped when its main aspects could be located in the transference.