Not a silly question. Every man who has gone through puberty will grow some pubic hair. Usually it will gradually get thicker and expand in the areas it grows during puberty. Not everyone however grows the same amount or in the same pattern. The amount and even colour of pubic hair can also continue to change long after puberty into adulthood.
Most men who have gone through puberty will also grow some degree of armpit hair, again that can vary and change into adulthood.
What is vary variable however is how much other body hair a man will grow. Some are naturally very hairy all over, some can have a hairy ass, some might have a lot of thick pubes on the front but a relatively naturally smooth ass, some will have a “trail” of hair from the belly button to their pubes, for others that trail can fan out across their entire tummy. Some might have hair around their nipples and on their chest but not on their belly or back.
Again that can change with age and as you age you often end up with extra hair in new (and unwelcome) places such as the nostrils, ears, eye brows and backs of the fingers and thumbs!
Whether people trim, shave, wax or otherwise remove pubic and body hair is another thing entirely, and very much a matter of individual choice