A qualitative analysis of interview data with 41 rapists determined that five implicit theories (ITs) underlie rapists' offense supportive beliefs/feelings/motives: (a) dangerous world (DW)--where men have feelings of generalized anger and/or resentment toward others; (b) women are dangerous--where men hold a set of attitudes that are hostile toward women; (c) women as sexual objects (WSO)--where women are seen as primarily sexual objects; (d) male sex drive is uncontrollable--where sexual urges are seen all consuming; (e) entitlement--where men feel that they can do exactly what they want. Consideration of whether DW or WSO ITs were present or absent indicated that three main groups could be identified: Group 1: violently motivated--presence of DW and/or absence of WSO; Group 2: sexually motivated--presence of WSO and/or absence of DW; Group 3: sadistically motivated--presence of DW and WSO. These results are discussed in terms of treatment needs of rapists. (Contains 3 tables and 1 note.)