This text provides empirical research on some of the most controversial media issues of our times. The first chapter investigates such issues as the effects of viewing erotica. How are users affected? Are rapists users, and are they affected? Are there therapeutic effects of viewing erotica? The second chapter covers how violent depictions affect violence in society. What are the findings of various government commissions and other research on depictions of media violence? The third chapter presents theories on causes and prevention of violence. Are viewers desensitized to violence in society? Does long-term viewing affect more aggressive behavior? Are there ways to mitigate the effects of viewing violence? The final chapter covers how political content affects voters. How are receivers socialized politically? What is the hereditary vote? What knowledge is gained from political content? What are the effects of political debates? What is the nature and effect of bias in the media? What role does Internet content play?