The present authors conducted a study of the occurrence of victimization an
d the perpetration of sexual abuse among 43 in-patients with intellectual d
isability aged between g and 21 years who were admitted to a child and adol
escent psychiatric inpatient department over a period of 5 years. A retrosp
ective case-note review was employed that explored the nature and severity
of abuse in relation to the age, gender and level of disability. The preval
ence of abuse or abusive behaviour, i.e. 14% of 300 admissions, did not cha
nge over time. In 13 out of the 43 cases, the issue of sexual abuse was ide
ntified after admission. Victimization alone occurred in 21 cases, perpetra
tion alone in six cases, and both victimization and perpetration in 16 case
s. Fifty per cent of the victims had been abused by a member of their close
or extended family. Most cases (62%) were adolescents. There was only one
instance of a victim being abused by a female. However, there were five gir
ls who were perpetrators, all of whom had previously been victims. By contr
ast, 11 out of the 17 male perpetrators had been victims. Despite difficult
ies of disclosure, it was possible to establish that severely disabled pati
ents had suffered sexual abuse. The present data support theories which (1)
recognize gender differences in sexual abuse patterns and (2) have a devel
opmental perspective, incorporating the influence of adolescence.