@Sheril Clearly a model by Penfield not Freud. In “Is Sex Necessary?”by James Thurber there is a Thurber map, with the accompanying caption “Fig. 7. It is customary to illustrate sexology chapters with a cross section of the human body. The authors have chosen to substitute in its place a chart of the North Atlantic, showing airplane routes. The authors realize that this will be of no help to the sex novice, but neither is a cross section of the human body.”