Average penis size across the world is pretty similar. There is some research that indicates Asian males are a bit shorter but not by much. Believe me.

A Look at the Data Sources
The Raw Data
Far from being just dumb and insulting, these instances are just knots on a fuse that winds back to the 19th century, when exclusionary attitudes toward Asians in America were first ignited. A rise in national wealth and its appetite for infrastructure, notably on the Western frontier, brought waves of Chinese and other Asian workers to build America up. And where Asian women were exotified and teased into a toxic yellow-fever stereotype , Asian men were depicted as submissive, physically impotent beings who schemed with their brains in order to compensate for small dicks. This, despite modern research saying that the vast majority of Asian men have average-sized penises , with a fairly normal distribution of extra-big and extra-small examples. Some Asian men fight back against the stereotype by bellowing about falsehoods and poring over scientific studies, as on the subreddit AznIdentity, where users compared more than a dozen published pieces of penis-size research to reaffirm that Asian dicks are average. Others try to compensate by showing off their big dicks, bucking the stereotype in public forums. Others still try to ignore the myth altogether. Whichever the case, the stereotype is something that Asian men learn to live with, in the same way that black men contend with assumptions that they must have giant genitalia and the lack of intellect to match, as many racist caricatures propose.
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Human penises vary in size on a number of measures, including length and circumference when flaccid and erect. Besides the natural variability of human penises in general, there are factors that lead to minor variations in a particular male, such as the level of arousal , time of day, room temperature, and frequency of sexual activity. Compared to other primates, including large examples such as the gorilla, the human penis is thickest, both in absolute terms and relative to the rest of the body. Measurements vary, with studies that rely on self-measurement reporting a significantly higher average than those with a health professional measuring. As of [update] , a systematic review of 15, men, and the best research to date on the topic, as the subjects were measured by health professionals, rather than self-measured, has concluded that the average length of an erect human penis is
Yeah, Asian-American men are sexy! Ah, right, because we as a society have somehow been misinformed about Asian-American men through persistent myths and caricatures in the media and in our daily lives. Thanks, racism. You mean Asian-American men are like regular guys, too?