Two cases of nymphomania were presented and psychodynamic factors of them were elucidated . The first case, widowed 3years before and age of 72, showed no organic basis of nymphomania , but in the study of her life - long pattern of sexual adjustment it was found that her personality is typical hysterical one and fixated to the mother object choice. The second case, widowed 15 years before and age of 76，bad. life long pattern of obsessive com pulsive adjustment and supposed to be frigidin her marital life . After being widowed 10years and death of her eldestson . who had unhappy marital life , while taking care of her grand children , she suddenly developed the impulsion of decapitatin g her grand children and sexual impulse to ward her soninlow and male relatives. This incesteous impulse supposed to be the results of her weakening of repressing power to the sexual impulse . According to Thoinot and Weyese，s classification , the first case belong to the active type of nymphomania and the second case to the platonic one.