Well typically for me sex is one round and I'm out. Refraction period, 20 mins or so, but then even after that the quality of erection isn't what is was the first time around.
With the V, or the "blue smurf" as I like to call it.. you get a better quality erection for the first round.. rock hard.. not that I am not already.. but it just gives the extra boost. Then for the second round you get it harder quicker and its again a fuller better quality erection.
Its a recreational thing.. I don't use it all the time, I use it maybe 1 out of 20 or 30 times I have sex.. My original question was just to make sure that I wouldn't 1) endanger myself by taking V after a night drinking.. and 2) that the V would still be effective after a night drinking.
So to answer your question, no I can't fuck all night long with little or no letup.
Brian