(067) Masturbation Grip Strength and Perceived Intravaginal Pressure Differential Are Associated with Self-Estimated Intravaginal Ejaculation Latency Time: A Retrospective Study

Introduction Masturbation, as a quite prevalent sexual activity, has potential impacts on sexual health. Despite its controversial standing in both public and academic discussions, research on how it affects the control of the ejaculatory reflex, as measured with the intravaginal ejaculatory latency time (IELT) remains scarce. Objective We aimed to determine whether men’s masturbation behaviors correlate with their IELT during vaginal intercourse. Key factors of interest included the difference between masturbation grip strength and perceived vaginal tightness (“pressure difference”) and the predominant region of penile stimulation during masturbation (shaft vs. glans vs. full-length). Additionally, we evaluated the accuracy of machine learning models in classifying IELT categories based on these behavioral factors. Methods This single-center retrospective study involved 470 male patients enrolled between January 2020 and March 2022. Collected data included age, body mass index (BMI), and detailed masturbation behaviors such as grip strength, as compared to the perceived intravaginal pressure during intercourse. Various machine-learning models were utilized to analyze the relationship between masturbation habits and IELT. Results Compared to the IELT ≤ 3 minutes group, the IELT > 3 minutes group showed no significant statistical differences in masturbation frequency, age at masturbation onset, and duration of masturbation. However, the difference between masturbation grip strength and perceived intravaginal pressure was identified as a significant factor affecting IELT (p<0.05), with individuals exhibiting greater grip strength and perceived intravaginal pressure differential having significantly longer IELT than those with lesser grip strength and pressure differential. Further analysis through machine learning models revealed that specific aspects of masturbation behavior significantly impact IELT, with the random forest model and support vector machine (SVM) achieving accuracies of 0.82 and 0.85, respectively, highlighting the importance of masturbation grip strength and perceived intravaginal pressure differential in predicting IELT. Additionally, men who masturbated stimulating mostly the body of the penis as opposed to other modalities showed a significant trend towards longer IELT. Conclusions This study provides preliminary evidence of a potential link between masturbation behaviors, particularly grip strength and perceived intravaginal pressure differential, and IELT. These findings not only challenge the common misconceptions about the negative impacts of masturbation but also offer a scientific basis for enhancing sexual health education and improving public understanding of masturbation. We encourage further research to explore how masturbation behavior affects male sexual function and how these effects vary across different populations. Disclosure No