Symptomatic finasteride users had “significantly lower International Index of Erectile Function composite score” and “significantly lower scores for each of its domains of erectile function, sexual desire, orgasmic function, intercourse satisfaction, and overall satisfaction.”…There exists “a significant positive correlation between a subset of Beck Depression Inventory scores related to negative attitude and blood oxygen level dependent activity.“
—Characteristics of Men Who Report Persistent Sexual Symptoms After Finasteride Use for Hair Loss: The Journal of Clinical Endocrinology & Metabolism, July 2018