Psychopathia sexualis: With especial reference to contrary sexual instinct

2. On the basis of acquired contrary sexual instinct:—

(_a_) As a result of long years of onanism, which finally causes impotence for women with continuance of intense sexual desire. (_b_) As a result of severe mental disease (senile dementia, brain-softening of the insane, etc.), in which, as experience teaches, an inversion of the sexual instinct may take place. Passive pederasty occurs:— I. As a _non-pathological_ phenomenon:—