East Asians are smell less when they sweat compared to the rest of the world, and here's why

Scientists have found that East Asian people (Chinese, Koreans and Japanese) have fewer and smaller apocrine sweat glands that the rest of the world's population. This could be because their ancient Northeast Asian ancestors adapted to colder climates.

This means that Asians sweat much less and are generally less prone to body odour. The gene that determines axillary body odour also determines which type of ear wax is produced by the body. Most of the population secrete a wet type of earwax. Genetically, Asians are prone to produce dry earwax.

Asians also have a much lower concentration of protein in their axillary sweat, which decreases body odor even further. Body odor is largely influenced by major histocompatibility complex (MHC) molecules. These also play an important role in immunity.

Scientific experiments have shown that people and animals find each other more attractive if their MHC compositions differ from each other. It is believed that this ensures variability in the population. Another reason could be to prevent inbreeding.

(Source)