>>106529692
the only ones I know about are that the Japanese believe they have longer intestines than most humans (like 1.5 times as long), and they attribute that to why they poop so much (I don't get the logic either. Also, the Japanese believe their erections are 'harder' than Westerners. No clue how you would verify that one, but I think it's cope due to the whole 4 inch average thing.