The purpose of the present study was to examine the interrelationships between adult attachment style, commitment, frequency of, variety, and motivation for sexual behavior in non-married dating relationships. One hundred and eighty-three participants completed a Relationship Questionnaire which included measures of adult attachment style, commitment level, and pilot questions which explored sexual behaviors for which the participant could endorse frequency and motivation for participation. Significant relationships were found between attachment style, commitment, and motivation for sexual behavior. Insecure attachment was found to be related to sexual behavior that was motivated primarily by the desire to avoid displeasing one’s partner, and was also negatively associated with commitment level. Findings, limitations, and directions for future research are also discussed.