Evaluating Sexual Psychoeducation in Couples With Sexual Desire Discrepancy

Condition(s) studied

Investigational drug(s) / intervention(s)

STEP-T: 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.

STEP-NT: 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.

Waitlist: 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.

Study summary

Sexual desire discrepancy (SDD) occurs when partners have different levels of sexual desire and are distressed by it. It is one of the most common reasons couples seek help, but no proven dyadic treatment currently exists. This study will test STEP, an online program designed to support couples with SDD. The investigators will compare two formats of STEP: one with therapist support and one self-guided, against a waitlist control group. The investigators will also assess how satisfied couples are and how they engage with the two online formats. This study will generate new data on how effective STEP is with and without guidance, and inform treatment guidelines.

Eligibility

Primary outcome measure(s)

• A change in relational sexual distress — At baseline (T1), post-treatment (2-4 weeks after STEP completion; T2), and 6-month follow-up (T3).
  Relational sexual distress will be measured using the 6-item Relational Concern subscale of the 30-item Sexual Satisfaction Scale (SSS; Meston \& Trapnell, 2005).
• A change in personal sexual distress — At baseline (T1), post-treatment (2-4 weeks after STEP completion; T2), and 6-month follow-up (T3).
  Personal sexual distress will be measured using the 13-item Female Sexual Distress Scale-Revised (female version: FSDS-R; Derogatis et al., 2008; male version: Santos-Iglesias et al., 2018).
• A change in perceived sexual desire discrepancy — At baseline (T1), post-treatment (2-4 weeks after STEP completion; T2), and 6-month follow-up (T3).
  Perceived sexual desire discrepancy will be measured by asking participants questions on their personal desire and their personal perception of partner's desire. Personal desire will be assessed by the 7-item Partner-related sexual desire subscale of the 13-item SDI-2 (Castro-Calvo et al., 2024). The personal perception of partner's desire will be measured by adapting the original version of SDI-2. SDD will be calculated by doing the absolute difference between one's personal desire and the personal perception of partner's desire scores.
• A change in actual sexual desire discrepancy — At baseline (T1), post-treatment (2-4 weeks after STEP completion; T2), and 6-month follow-up (T3).
  The actual sexual desire discrepancy will be measured by calculating the absolute difference between both partners' personal desire scores. Personal desire will be assessed by the 7-item Partner-related sexual desire subscale of the 13-item SDI-2 (Castro-Calvo et al., 2024).

Trial sites (2)

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