Danish criminologist Berl Kutchinsky's Studies on Pornography and sex crimes in Denmark (1970), a scientific report ordered by the Presidential Commission on Obscenity and Pornography, found that the legalizing of pornography in Denmark had not resulted in an increase of sex crimes [REF].
Some researchers claim there is a correlation between pornography and a decrease of sex crimes,[REF][REF][REF][REF][REF][REF] including Diamond (author of a review from 2009) [REF].