Does taking vicodin and energy drinks decrease blood flow to the penis while having sexual intercourse?

Hard to say: Difficult to say but seems like a poor combination nevertheless.

Dangerous: Using opiates for any purpose other than what they are intended is dangerous. High dose caffeine energy drinks are also unproven in terms of safety, and recently deaths have been reported. The best aphrodisiacs are a loving and caring relationship between 2 people, and using imagination and creativity in love-making. Drugs do not and should not enter into this. Caffeine/opioids both decr. Flow.