I don't know where to get data. I've seen the Reeperbahn in Hamburg (rather an amusing place BTW), where there are both places with porn booths and prostitutes (legal) on the streets. The prostitutes seem to be doing a good business - but I couldn't guess at the relative amounts of traffic.
I guess that as porn technology gets better there may be fewer men hiring prostitutes. On the other hand, the internet has made it a lot easier to find prostitutes. Not sure how the balance is going.
I do know that for me a person would always be superior to a movie (ignoring risks, morality, etc) .
stories like these make me worry about my relationship 
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