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Quantification of "Mercy Sex" in Heterosexual Women.

Guptan N, Simon JA.
Journal of sex & marital therapy · May 18, 2026
Plain-language summary

This paper introduces and quantifies the concept of "mercy sex" — defined as sexual activity engaged in by women diagnosed with hypoactive sexual desire disorder (HSDD) despite a documented absence of sexual desire or receptivity. The authors reviewed baseline data on sexually satisfying events (SSEs) drawn from a convenience sample of published, peer-reviewed, prospective, randomized, placebo-controlled clinical trials evaluating HSDD pharmacotherapies (including testosterone, flibanserin, and bremelanotide) conducted over nearly a decade. Baseline SSE data were analyzed across variables including time, age, reproductive status, and geographic region. The study found that women enrolled in these trials reported engaging in sexual activity approximately 2.5 times per month at baseline, despite meeting criteria for HSDD. The authors propose biopsychosocial explanations for this behavior and argue that mercy sex may confound HSDD trial outcomes by inflating baseline SSE rates, potentially skewing assessments of therapeutic efficacy, influencing sample size calculations, and complicating the definition of a clinically meaningful treatment response when SSEs serve as a primary endpoint. Limitations include reliance on secondary analysis of existing trial data and the use of a convenience sample. The paper does not conduct a new primary trial but offers a methodological and conceptual critique of HSDD clinical research design.

Why this grade: This is a secondary analysis and conceptual review of existing RCT baseline data rather than an original primary trial, limiting its ability to independently establish causal or efficacy claims.

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Abstract

Women with hypoactive sexual desire disorder (HSDD) lack the thoughts, desire, or receptivity to sexual desire, causing personal difficulty and distress (DSM IV-TR). However, HSDD clinical trials evaluating testosterone therapy, flibanserin, and bremelanotide spanning nearly a decade show women with HSDD, encompassing low to no sexual desire, are still engaging in sexual activity. We aimed to define this sexual activity as "mercy sex", quantify its frequency, and provide hypothetical explanations for this behavior. We reviewed baseline data on sexually satisfying events (SSEs) from a representative convenience sample of published, peer-reviewed, prospective, randomized, placebo-controlled trials of women with HSDD. Baseline data were assessed across time, age, reproductive status, and geography. Women in these studies engaged in "mercy sex" about 2.5 times/month despite their documented HSDD. These results have important implications for further HSDD clinical research, as mercy sex frequency may skew therapeutic efficacy while having significant implications in calculating trial sample size, and assessing a clinically meaningful response to therapy, when SSEs are used as a primary endpoint. Although this paper explores only a biopsychosocial explanation for the phenomenon of mercy sex in clinical trials of HSDD therapies, it provides a valuable understanding that will benefit patients, clinicians, and researchers.

Educational summary of published research — not medical advice. Full text is shown only where licensing permits.