The focus of this article, the fourth in the series, Standards for Clinical Trials in Male and Female Sexual Dysfunction, is on aspects of clinical trial design and measurement that are specific to clinical trials for treatments of female sexual dysfunction. Challenges in this area include the limited extent of treatment development and clinical trial research across the spectrum of female sexual dysfunctions, changing regulatory considerations, changing diagnostic criteria for female sexual dysfunction, and the need to articulate assessment procedures to these changes. Discussion focuses on approaches to addressing these challenges in clinical trials in female sexual dysfunction.