I've encountered several f-words in 'Dreams from my father' by Obama. Examples: 'f..ing', 'motherf...r', 'get the f..k outta my face'.
I understand the author choses them to provide a more true-to-life narrative.
How would an average US/non-US reader feel about that? The idea is also that it's a public figure of some importance (though not the President at the time of writing).