I remember reading that a lot of the serial killers were porn addicts and that over addcition to porn correleate to higher sex crimes, but i found a couple of studies that refute that belief.
it seems that a more sexual freeing society can decrease the incidence of sex crimes. So maybe the suppression of sexual urges are causing more problems for the society than the expression of it.
The incidence of rape in the United States has declined 85% in the past 25 years while access to pornography has become freely available to teenagers and adults. The Nixon and Reagan Commissions tried to show that exposure to pornographic materials produced social violence. The reverse may be true: that pornography has reduced social violence.
According to his number crunching, between 1980 and 2004 the four states with the lowest internet access rates had a 53% increase in rape, while the four states with the highest internet access experienced a 27% decrease.
A lower per capita crime rate and historically high availability of pornography in many developed European countries (e.g. Netherlands, Sweden) has led a growing majority to conclude that there is an inverse relationship between the two, such that an increased availability of pornography in a society equates to a decrease in sexual crime. Moreover, there is some evidence that states within the U.S. that have lower rates of internet access have a greater incidence of rape
Presently in Japan, sexually explicit video tapes, books, and magazines which cater to all sorts of erotic interests and fetishes are readily available. These include sexually obvious manga without age restrictions as to availability. Phone booths in commercial areas and city newspapers contain advertisements for sexual liaisons of every sort. However, this availability of modern pornography is relatively new.
In Japan, rapes decreased 79 percent while public indecency decreased 33 percent. The reason for the difference is not clear. We believe the compulsivity generally associated with the crimes considered under the public indecency law are less easily modified than is rape.
Japan has the lowest number of reported rape cases and the highest percentage of arrests and convictions in reported cases of any developed nation. Indeed Japan is known as one of the safest developed countries for women in the world (Clifford, 1980)
Wilson (1978, pp. 175) found that "Males who develop deviant patterns of sexual behavior in adulthood have suffered relative deprivation of experience with pornography in adolescence." He suggests that pornography not only can, but does, help to prevent criminal sex problems (pp. 176). Wilson claims exposure to sexually explicit materials can have therapeutic advantages and, among couples, help by promoting greater communication and openness to discuss sexual matters, and provide sex education. It can also help by providing an anxiety and inhibition-relieving function. Thirty-nine percent of the convicts surveyed by Walker (1970) agreed that pornography "provides a safety valve for antisocial impulses."