It may not be true that "everybody" has seen strippers, but I would bet that by the age of 25, 80% of American men have seen strippers, a porn movie, or purchased an "adult" magazine. Maybe only 5-10% (or less) make a regular and permanent habit of this sort of thing, but among young men it is indeed "normal."
went to a strip club a few times when I hit 18. After two or three times, it was boring and not even entertaining. I am 30 now and could care less about going to one as it is a waste of money and time.