I've seen plenty of other studies which came to precisely the same conclusions, the earliest of which was conducted in Denmark in the 1950s; that one found that after the decriminalization of pornography and the official tolerance of prostitution, the number of rapes in all of Denmark for the following decade was roughly similar to the number of rapes in Copenhagen alone for the previous year. In fact, I was looking for that study when I found this one.
I know not about the other studies you cite so I can't make a comment about them but there is one inescapable truth about research: "Garbage in. Garbage out."
This study's flaws aren't nearly as egregious as the garbage "studies" the radical feminists and gay rights lobby get the public to eat every year.
Agreed and let us not forget about "Global Warming".