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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
Actually, the effect can be the opposite as your blood alcohol level increases. Alcohol is a depressant, and using it heavily can dampen mood, decrease sexual desire, and make it difficult for a man to achieve erections or reach an orgasm while under the influence.