Universally accepted diagnostic criteria do not exist for pornography addiction or problematic pornography viewing. Pornography addiction is often defined operationally by the frequency of pornography viewing and negative consequences. The only diagnostic criteria for a behavioral addiction in the current "Diagnostic and Statistical Manual of Mental Disorders" are for pathological gambling, and they are similar to those for substance abuse and dependence, such as preoccupation with the behavior, diminished ability to control the behavior, tolerance, withdrawal, and adverse psychosocial consequences. Diagnostic criteria have been proposed for other behavioral addictions, and these are usually also based on established diagnoses for substance abuse and dependence.