Even some well educated people do not care about this one. Human body has its odor which is more offensive than it is pleasing. As we age, our aroma gets more nasty. All human orifices smell if not adequately cleaned.

It is very difficult to make the people realize though. Be it out of courtesy or anything. And they themselves hardly ever realize coz the sense of smell is the one with the quickest period of desensitization and acclimatization. They never even know!