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Adrenaline is an anti-erection chemical and is the main driver in the fight-or-flight response, when men have had failed attempts at sex, or they have developed anxiety and stress because of previous failed attempts, adrenaline kicks in and contributes to erectile dysfunction by shifting the blood away from the penis. The term' psychological erectile dysfunction' puts the blame on the man. I prefer to call it' adrenaline-mediated erectile dysfunction.'.