From what I've been told the most common fetish request is taking a dump at the same time as smoking with a mask on and tickling with a whip whilst simultaneously deep throating.
Strangely enough, this is also the one of the most disliked by escorts.
Another is unnecessary vowels in the word escort, lack of gs at the end of words and the use of u for the word you and lack of punctuation.
Go figure !!