This research project investigates the factor structure, reliability, and validity of the Marlowe-Crowne Social Desirability Scale (MCSDS) when used with a sample of convicted, adult male sexual offenders. Results confirm the two-factor structure (Denial and Attribution) originally proposed by the authors (Study 1, n = 247). Results also reveal that the full-scale MCSDS has strong internal consistency estimates (Study 1), discriminant and convergent validity (Study 2, n = 91), and test-retest reliability over a 3-week period (Study 3, n = 74). Information is provided to aid evaluators' interpretation of MCSDS full-scale and factor scores when used with male adult sexual offenders.