Incest is therefore most often practised between father and daughter, both in real life and in the imagination of girls and men alike. The abhorrence, which as said above has its roots in our nature, results in strong social disapproval. The disapproval of incest, especially between father and daughter, is a classic example of 'projection'. The alleged reason for disapproval is that incest is the same as sexual abuse, aggression and violence. These are all rational arguments, but they are used to justify an irrational opinion.
In fact, most cases of incest have little to do with violence.