Identification of variables differentiating clinical subtypes of child molesters is central to theory assessment and practice specificity and innovation. The present study utilized the MMPI to assess the impact of the following variables in a sample of 90 incestuous molesters: a) history of physical abuse as a child; b) history of sexual abuse as a child; c) presence of substance abuse during the molestation; d) number of incidents of perpetrated molestation; e) relationship to the child; f) victim's age; and g) type of molestation. Results revealed statistical differences between child molesters on variables b, c, and d with particular clinical relevance found for variable b. Implications of the findings are discussed. 3 tables and 17 references. (Author abstract)