P/S/A: earwax type varies by race. Asians and Native Americans tend to have "dry" earwax while Africans and Europeans tend to have "wet" earwax. Ear cleaning is primarily an Asian practice because it's adapted to dry earwax. (I have a terrible story about how I found this out by asking a white girlfriend of mine to clean my ears.)

P/S/A: the same genetic variation that controls earwax type above also controls underarm odor, which is less common among people with dry earwax than wet earwax. (I have a terrible story about how I found this out by telling a group of white people I knew that I had never used deodorant before.)