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This meta-analytic review examines the effect that exposure to pornography produces on aggressive behavior under laboratory conditions considering a variety of possible moderating conditions (level of sexual arousal, level of prior anger, type of pornography, gender of subject, gender of the target of aggression, and medium used to convey the material). The summary demonstrates a homogeneous set of results showing that pictorial nudity reduces subsequent aggressive behavior, that consumption of material depicting nonviolent sexual activity increases aggressive behavior, and that media depictions of violent sexual activity generates more aggression than those of nonviolent sexual activity. No other moderator variable produced homogeneous findings. The implications of the results for theoretical approaches to understanding the impact of pornography receives discussion, as do the limitations of such findings.