In a consecutive series of 1140 male subjects reporting a stable couple relationship and different degrees of sexual dysfunction, we evaluated the impact of relational factors, as assessed by the Structured Interview on Erectile Dysfunction (SIEDY) Scale 2 (exploring, as reported by the patient, menopausal symptoms, partner's medical illness interfering with sexual activity, and reduced partner desire and climax). We found that the SIEDY Scale 2 is significantly and independently associated with erectile dysfunction (ED), delayed ejaculation, hypoactive sexual desire, and decreased frequency of intercourse. SIEDY Scale 2 scores are associated with an advanced age of the partner and a long couple relationship, independently from patient's age. In addition, an increased relational factor correlates with increased extramarital affairs, conflicts in the couple, alcohol abuse, and presence of depressive symptoms, as assessed by the Middlesex Hospital Questionnaire. Our results should encourage the andrologist to consider the context in which sexual symptoms develop, analyzing the relationship and partner's behaviors and diseases. Resolving, or at least ameliorating, the relational background and the sexual framework might help in treating male sexual dysfunction.