you'll never get a straight answer to any of these questions as they really don't exist. Escorts may or may not want to be filmed, and they can charge over a large spectrum of prices, This question lends itself to an ad hoc analysis of each girl you're thinking of putting in a movie since they all of them would value themselves differently. I think it will be impossible to answer this question to your satisfaction, plus they're are other threads on the forum that deal with what girls charge for scenes; you won't find a straight answer in there either.

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