In the case of mild gender identity disturbance, the person is aware of his or her assigned sex, but experiences discomfort and a sense of inappropriateness about it. When disorder is severe, the person has the sense of belonging to the opposite sex. In childhood girls or boys have a persistent and intense distress about their sex and their anatomic structures. With boys the grossly feminine behaviour may lessen during the adolescence, but up to two-thirds of the boys with the disorder develop a homosexual orientation. Only a minority of females retain the masculine identification and of those only some develop homosexual orientation.