http://www.businessinsider.com.au/heres-what-men-in-asia-eat-to-boost-their-libidos-2013-10 A one date date
holy smokes... i think i would rather just slap on some T cream and be done with it. i must say "most" humans came out on the short end of mammalian penis evolution.
Actually this is not true. Compared to similar animals of our stature, the average human penis is ridiculously large due to evolution.
On a completely unrelated note I'm going to China next week. I really am. I saw this thread title and just hopped in. I'll try to avoid animal dongs.
When they say Asia they mean China... aka, where they will eat anything. I can assure you this is not common throughout the rest of Asia.
the other option for Chinese men to improve their libido is to not have to fuck ugly Chinese bitches.