Evaluating Sexual Psychoeducation in Couples With Sexual Desire Discrepancy

Couples in the STEP-T group will meet online with a therapist for 120 minutes once a week over 8 weeks. Each meeting consists of a therapist-led session focused on the psychoeducational content from the STEP module. Sessions begin with a review of the homework completed during the previous week and end with the assignment of new sex therapy homework related to that day's session. After each session, the therapist will email the couple the module that includes the session's psychoeducational handouts and the sex therapy homework to be completed prior to the next session.

Couples in the STEP-NT group will receive STEP (i.e., one module per week for 8 weeks, including psychoeducational handouts and sex therapy homework), without the therapist-led online sessions. However, like couples in STEP-T, they will be allowed to contact the research team for clarifications related to the structure, instructions, or technical aspects of the exercises. This support will be limited to non-clinical guidance and will not involve any individualized feedback regarding participants' personal experiences or relationship dynamics.

While couples randomized to STEP-T and STEP-NT will complete one online baseline assessment battery before randomization, those assigned to the waitlist control condition will complete two baseline assessments online, spaced 10 weeks apart, before being randomized to one of the active treatment groups (i.e., STEP-T or STEP-NT). The 10-week waiting period was selected to match the time it takes couples to complete the 8 modules of STEP. This design allows us to determine that improvements in clinical outcomes are due to the STEP intervention rather than the mere passage of time. Following the post-waiting period assessment (i.e., the second baseline battery), waitlist participants will be randomized to STEP-T or STEP-NT.