You can read about L-Arginine and Pycnogenol here:
http://www.pegym.com/forums/general-...rking-try.html. The two are good at increasing blood flow (or so "they" say) and helping control free radical damage.
Omega 3's are good for the heart and blood circulation, which is what keeps the penis going. Here's the wikipedia page on Omega 3's:
Omega-3 fatty acid - Wikipedia, the free encyclopedia