During the phallic stage, boys experience feelings of desire for their mother. They are rivalled by their father for her attention and as a result, wish to remove him. Boys fear their father finding out about this, and they experience castration anxiety. The ego defence mechanism repression causes the boys to repress their desires for their mothers and to identify with their fathers. Once this occurs, the boys will internalise their fathers’ gender roles, attitudes and behaviours, internalising these as their own gender traits.