It's also worth noting than Asians have the fewest number of sweat glands in the body and Africans/blacks have the most, with white people in between the two.

I think this all depends on what bathroom facilities people have access to and whether these are in good working order. If men want to impress women and vice versa, personal hygiene improves dramatically!

HI , I think " Personal Hygien " is not a cultural behaviour . It is not only for specific kind of ppl and some not . There are many men, who are from english spoken countries , have an offended odor . While there are many not english spoken men have a magnificant smell . Personal hygine is a personal habit according to what a person (woman or man ) used to do since he / she was a child . You can find among the same country with the same language spoken differant Hygenical habits , some ppl are mostly clean and tidy with very good smell while at the same place you find another ppl with very bad odor and untidy looking . So you have to be more open minded and not judge on a general things through personal things .

You've really opened up a can of worms with this question! I have frequently heard comments by Asians about how sweaty and smelly Westerners can be. The last time I was in China, a Chinese woman asked to switch places with me on an airplane because she couldn't stand the smell of the African woman next to her. Ironically, my previous flight I was next to a Chinese woman who smelled just as bad! It is probably true, on average, that Westerners sweat more than Asians (but that obviously depends on what each person is doing!), but I also think it is true that Westerners pay more attention to hygiene then Chinese. I've had several classmates from China who when they first entered my university smelled kind of "ripe." After awhile, they seemed to adopt our customs and that wasn't a problem anymore. I've particularly noticed that Chinese female students seem to quickly pay a lot more attention to hygiene and things like nose hairs after a month or two in the States. As for me, I take a shower every morning and every night! I think that this is easier in developed countries, however. There are many places where I'd hate to waste that much water and electricity.

in addition, personal hygiene also involves brushing teeth/floss/moutwash and using deodorant