Use of Rasch person-item maps to validate a theoretical model for measuring Attitudes toward Sexual Behaviors.

In general, the Attitudes toward Sexual Behaviors (ASB) or Sexual Attitudes measures have not been focused in the conjoint measurement of persons and items in the same construct, and have not reflected the new sexual behaviors neither the context where sexual behaviors take place. The purpose of this study was to provide evidence of the validity of a theoretical model for the measurement of ASB using the person-item map provided by a Rasch model. The theoretical model explicitly defines the ASB construct and makes a proposal where the items are intensity-ordered. It also considers the context in which sexual behaviors take place and their new ways of expression. ASB measurement was applied to two samples of 300 and 584 young people aged 18 to 30. Content of the ASB test administered includes the operative definition proposed. The results showed a good fit of the data to the model, and adequate measurement accuracy. The person-item maps showed that the items are distributed according to the theoretical model proposed in both samples. The easiest items for participants to endorse are those reflecting frequent dyadic sexual behaviors with a steady partner, and the hardest items for participants to endorse are those reflecting sexual behaviors via Information and Communication Technologies. The obtained results permit to conclude that there is favorable validity evidence for the theoretical model proposed for measuring ASB in heterosexual young people.