As an early teen I would of course look up "rude" words, but also of course the dictionaries I had access to then would contain none.
When I was about 18 I bought a more comprehensive dictionary - nothing massive but one volume about the same size as a pair of insight books bound together.
And of course the first thing I did was look up to see what rude words were in there.
Now I tend to use online for spelling (using real English - none of this New World colonialist stuff - perhaps you can think of a rude word to describe my attitude? ) and definition.
Yes, the dictionary in book form has for me gone the way of the typewriter - fallen into desuetude.