The assessment of sexual aggression presents many difficulties for cli
nicians. The tendency of offenders to minimise or deny their offending
, and their frequent distrust of mental health professionals, require
high levels of skill to circumvent. In addition, the multifactorial na
ture of rape means that assessment needs to cover a broad range of con
tent areas and utilise a number of different methods. In this paper we
suggest that a comprehensive assessment should inquire into the devel
opmental history of rapists, social competency, attitudes and beliefs
about women and sexual crimes, sexual knowledge, sexual preferences an
d disorders, empathy, offence variables, psychiatric history, and subs
tance abuse. The clinical interview remains the primary method of info
rmation acquisition, and needs to be tailored to match the particular
interpersonal style of rapists. The use of psychometric and physiologi
cal measures are also valuable sources of clinical data.