I'm sure Chinese/ Asian men use this same line about china et al
I might not be an expert on penises worldwide. I don't know whether you are either. However, I have read that there is no evidence that penis size is actually determined along racial lines. If you have evidence to the contrary, I'd be interested to read. Wikipedia says the mean size of men's penises is between 5.1 and 5.9 inches and that's from worldwide studies.