A 39-year-old man presented with penile swelling, pain and hematoma associated with sexual intercourse. On exploration, he was found to have ruptured the superficial dorsal vein of penis, which was ligated. He had an uneventful postoperative recovery and has resumed normal sexual life. A rectangular-shaped suprapubic and distal penile hematoma with sparing of the proximal penile skin was observed. We believe that this physical sign could aid clinical diagnosis of a ruptured superficial dorsal vein of penis.