Sex offenders are characteristically action-prone, aggressive, impulsive, socially deviant, and often exhibit meager fantasy skills. Others may be given to a repetitive obsessive fantasy that spills over into action. Because there is a linkage between fantasy and behavior, fantasy training can be used to reduce acting-out behavior of these individuals. The goal of fantasy training with an individual given to thoughtless action is to use actionless thought as an additional coping style. In cases of repetitive, obsessive thought, elements may be introduced into the fantasy that alter or interrupt its idosyncratic meaning (i.e., arousal, feelings of superiority) to the client. Fantasy is taught by structuring and encouraging individuals' imagination skills through exercises that help them to visualize and regroup images into a personalized scenario. Constructive alternative behavioral responses can be incorporated into clients' behavior repertoires through fantasy. 38 references.