Rick Santorum one of the Republicans seeking the presidential candidate nomination in America posted a piece on how and why he opposes pornography with some claims that he suggests is backed up by research (of which none is cited):
America is suffering a pandemic of harm from pornography. A wealth of research is now available demonstrating that pornography causes profound brain changes in both children and adults, resulting in widespread negative consequences. Addiction to pornography is now common for adults and even for some children. The average age of first exposure to hard-core, Internet pornography is now 11. Pornography is toxic to marriages and relationships. It contributes to misogyny and violence against women. It is a contributing factor to prostitution and sex trafficking.
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Is it true that research has shown that an increase in the availability of pornography leads to an increase in prostitution and sex trafficking?