>>19282662Smell is combination of genetics and diet.
First, in general East Asians have less apocrine glands (located in the armpits and genitalia, these are sweat glands that produce pheromones) than Caucasians and Africans. These pheromones are digested by bacteria to produce the musky "body odour".
Second, Japanese diet is centred on seafood and whole foods, with none of the processed crap. They will definitely smell better than the typical American on fast food.
Though, it is undeniable that any human who does not take a bath will still smell horrible.