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Classically incest is connected to perversion and remains, on the whole, not much studied. Authors in the West underline the psychosis scarcity in father-daugther incest and give much more importance to the socio-economic factors. In Tunisia, and through only one case of father-daugther incest, with sodomy, did some differences in relation of classical notions appear to us. The paranoiac father, who was a latent homosexual, a state which turned up at the time of his son's birth, will use the "incest" as a defence against the appearance of delusion. A brief socio-psychological analysis of man-woman and father-daugther relations, in the arab society, ends up with the conclusion that incest is unacceptable and has something to do with pathology.