The symptom of crying immediately after completion of the sexual act was found in a number of partially frigid female patients. Material from the analyses of a few of these is discussed in the light of the theory of the transformation of instincts. The importance of oral-erotic elements in early libidinal development is stressed. The oral-erotic is considered relatively more important than the anal-erotic, which has been, perhaps, over-emphasized. Two diagrams illustrate the inter-relationships of the various developmental processes in libidinal structure.