Rape is not a "sexual" act per se, but one of total control over another person. They get their kicks by violating victims weaker than themselves. Rape is an act of violence.
As for violence in general, IMO, there always have been violent people. I don't think anybody really knows why. Sometimes it just seems they are born.
Do movies about violence promote violence? I don't know. I do wonder if they can "inoculate" some viewers from the effects.
"Porn" has been around for a long time. From giggling at photos in National Geographic of topless tribal women, those "postcard", then Playboy, the curiosity is common. The only real harm I see is that some do not realize that the "letters" they read about in Hustler are pure fantasy, and the porn they view on the net does not mean that consent will be forthcoming to some activities in their personal relationships.
I do think that sex is now more considered a recreational activity, perhaps more obligatory in casual relationships, as marriage has not been exactly touted, even on network TV.
My reaction to the study is that it is a result of looking for a study to conduct, a failure to do preliminary research the pre-internet era, not interviewing the victims, and looking only for fodder to feed their pre-conceived opinions.
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