How exactly does porn increase violence towards women?

I would think it would more likely decrease it since sexually frustrated people will more likely stay in their homes masturbating rather then get angry and go out raping women.
Update: Most porn does not involve being violent towards women, it usually just involves sexual intercourse.
Update 2: I would think that if men did not have porn, their sex drive would drive them to rape.
Update 3: Plus theres no porn in Muslim countries and people in Muslim countries treat their women like sh*t.
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