Background <p>Most new parents will experience changes to their sexual relationship during the perinatal period, yet no accessible prevention programs exist to support couples in navigating these changes. Our aim was to assess the feasibility of the introductory modules of an online couple-based program (STORK) designed to promote perinatal sexual well-being. The program is grounded in empirically established risk and protective factors associated with couples’ perinatal sexual well-being.</p> Methods <p>We conducted a single-group feasibility study with eleven couples (22 individuals) expecting their first child (mean gestation 20&#xa0;weeks). Couples completed the orientation and first STORK modules during a 2-h online session with a researcher. Participants then completed an online survey evaluating the program’s feasibility and content. Qualitative semi-structured interviews and online questionnaires assessed participants’ experiences with the platform, focusing on usability, acceptability, clarity, relevance, and overall satisfaction.</p> Results <p>Participants reported high acceptability, rating both modules as clear and logical (<i>mean</i> = 5.6–5.9/7), enjoyable (<i>mean</i> = 4.7–6.1/7), helpful (<i>mean</i> = 5.0–5.7/7), and relevant (<i>mean</i> = 6.1/7). The platform was rated as easy to navigate (<i>mean</i> = 5.6/7) and highly inclusive (<i>mean</i> = 6.0–6.1/7). Most participants found the time commitment reasonable (95.5%), and 91% considered weekly completion with their partner feasible. Qualitative feedback highlighted usability, well-structured content, inclusivity, and support for personal and relationship reflection.</p> Conclusions <p>The findings suggest that the STORK program is a feasible and acceptable resource to support couples’ perinatal sexual well-being, warranting further evaluation of its effectiveness. A pilot randomized controlled trial is warranted and may facilitate a shift toward couple-focused perinatal prevention programs. The STORK program has the potential to fill a critical gap in perinatal healthcare by providing an accessible, evidence-based prevention program to support couples navigating sexual changes during pregnancy and postpartum.</p> Trial registration <p>This feasibility study was prospectively registered on June 17, 2025 (reg #2023-6719), and the registration can be found here: <a href="https://clinicaltrials.gov/study/NCT07036484">https://clinicaltrials.gov/study/NCT07036484</a></p>