How big of an injury to a flaccid penis could cause a venous leak? if you hit the area but no bruising occurred after does that mean no injury?

Here are some ...: Did you ask the same Q, which was answered before? Nonetheless, I would repeat: What you described indicates you didn't get an injury leading to venous leakage, which is usually referred to a rare cause for ED by inborn valve defect of penile veins resulting in insufficiency to shut off the blood outflow so to maintain penile engorgement and rigidity for sexual intercourse or masturbation. So, no.