Oldman, you're missing the point. Setting aside for the moment the concept that prostituted sex is actually rape because you can't buy consent, It doesn't matter a jot to feminists if that study is good, bad or indifferent.
It's that it asks and answers the wrong question.
It asks "Does men being able to sexually abuse prostitutes prevent them from sexually abusing non-prostituted women?". That's a terrible question. And in fact, from my cursory reading this morning, that first New York study has a number of flaws. I haven't time to read the rest right now. (their mechanism for the prevalence of sex crimes is "stop and frisk", so they are likely missing significant numbers, and they don't seem to ask the prostitutes if in fact they are being sexually assaulted, so who knows? Maybe the location of the crimes just moved, and in fact, the level remains unchanged and only the population affected differs).
What you're failing to grasp is that any analysis which takes as a given that men have irrepressible sexual and possibly violent urges that they simply must vent onto a woman or a woman-shaped sex robot is unlikely to pass muster in feminist debate. Your comment about the absolute need to wank only cements the fact that you've never challenged this view, in yourself or others.
The feminist starting point is to challenge the idea of male sexual entitlement, or at least to be aware of its existence as a thing. So there's no point in getting all flouncey if that's explained to you.
And it might also help to know that there is nothing quite like a thread about prostitution to draw a certain type of male poster here to tell women about why being able to buy sex is crucial and we need to STFU.