The victim-choice polymorphia of 178 sexual aggressors divided into six sub
types, incest offenders, pseudoincest offenders, sexual aggressors of famil
iar children, sexual aggressors of unfamiliar children, sexual aggressors o
f familiar women, and sexual aggressors of unfamiliar women, was compared.
Results showed that sex offenders remained stable in their choice of victim
from one offence to another in terms of victim age, victim gender and aggr
essor-victim relationship. Subjects characterised by high levels of polymor
phia were pseudoincest offenders and sexual aggressors of familiar women, w
hereas sexual aggressors of both unfamiliar women and unfamiliar children w
ere characterised by low levels of polymorphia. Recommendations regarding h
ow to further refine sex offender typologies are discussed.