Not all people react the same way to them. For some men, it can enhance their blood flow making it easier to get an erection. For others, though, it can overcharge the system and trigger the 'fight/flight' response, meaning your body wants to use the blood/etc for other than getting an erection. The ones with more types of B vitamins, and more of each of those, will give the reaction (good or bad). Many rely on caffeine which again can have a good or bad response in a guys body.

Re Re: Question on energy drinks...

It's better for you to grab a Jamba Juice smoothie or something like that, a few hours before gametime. Good luck!

5-hour power will def keep you up, awake, and alert

...Red Bull sugar free. It does enhance my mood and provides nice warm buzz.

Maybe another thing to consider is which ones also make your cum taste better.  After all, what's the use of having one of these energy drinks if your jism tastes like battery acid?

Personally, I prefer a nice shot of good, chilled vodka over any energy drink. It soothes the mind and prepared the libido!

The corner store stuff does work, but with the caffeine and sugar and artificial stuff you run a health risk if you drink them all the time to keep your energy up.

I know some guys who can't get a hard on yet they continue to smoke, are under a lot of stress, don't exercise.. etc. Get the blood flowing naturally and you'll be good to go anytime