When do you shave your under arms and down there?

You should shave your underarms when ever the hair is really noticeable. As for "down there" you don't really have to shave there, but if you want to, then shave whenever you feel you need to.

You should shave whenever you want to do so, as long as hair grow, then, shave it. As for "down there", if you want your partner spend more quality time on it, please please do shave it