But where is the logic behind inch, feet, yard, ounce, pound, stone, fl ounce, gallon, Fahrenheit etc.12am is midnight. I'm partial to the 24-hour clock myself, but it'll be a damned cold day in hell when I switch to metric. I don't care how big the number might be, I am not describing my cock in centimeters.
Oh, and I would say 20 cm sounds more impressive, than 8 inches.