I stopped wearing deodorant the year after high school. My brother stopped shortly after. We don't need it. Our armpits never stink. We played football for 10 years. Even after an august practice in full equipment our arm pits didn't stink. At first we thought it was diet but later our doctor said it might be genetic.

A few years ago a read an article that confirmed the genetic angle. A small percentage of the population caries a rare version of the ABCC11 gene. Unusually dry ear wax is also an indicator that you might be part of the no stink club.