From Dr Clay's book: "Anger plays a role in impotence, frigidity, and pornography.
Research has shown that watching more physically aggressive porno films increases the aggressiveness in males (Byrne & Kelley, 1981).
http://www.psychologicalselfhelp.org.../chap7_18.html
The above study was done prior to the allowed increase by the FTC in sexual acts and violence shown on tv. (That includes the changing of the sacred hours of family time once kept free from such material.)
BTW, the next part of that link covers "evil." It will be covered/posted in the anger and aggression thread in self-help soon.