The "do your own research" line does not address the simple facts that the CPUI is employed as an actual porn addiction test by other researchers, and the CPUI is not validated for perceived" porn addiction. Two reviews of the literature and a recent study say the Grubbs CPUI assesses actual porn addiction:

1) Examining Correlates of Problematic Internet Pornography Use Among University Student (2016)
2) Problematic cybersex: Conceptualization, assessment, and treatment (2015)
3) Questionnaires and scales for the evaluation of the online sexual activities: A review of 20 years of research (2014)

In fact, the 2016 study made a graph using the Grubbs CPUI and a porn addiction test derived from the DSM5 criteria for addiction. The results from Grubbs CPUI and DSM5 "actual porn addiction" questionnaire look nearly identical. Put simply, the results for the Grubbs so-called "perceived" porn addiction test are the same as the actual porn addiction test. The full paper with graphs and data -

Another fact you ignore - the Grubbs CPUI was never validated for "perception of addiction". Never. The CPUI assesses signs, symptoms and behaviors common to all addictions (see the CPUI below):

Another fact you ignore - all the Grubbs studies admit that the amount of porn use was STRONGLY correlated with scores on Grubbs porn addiction test (CPUI), Simple: the amount of porn use was related to porn addiction. So much for the spin.

1 - The Grubbs CPUI measures actual porn addiction. He relabeled it "perceived".
2 - Higher amount of porn use is correlated with higher scores on the Grubbs porn addiction test.
3 - Higher distress is correlated with higher porn addiction scores.
4 - Two recent studies found no relationship between religiosity and those seeking treatment for sex/porn addiction (Gola 2016, Reid, 2016)

The Grubbs Cyber Pornography Use Inventory (CPUI):

1. I believe I am addicted to Internet pornography.
2. I feel unable to stop my use of online pornography.
3. Even when I do not want to view pornography online, I feel drawn to it

4. At times, I try to arrange my schedule so that I will be able to be alone in order to view pornography.
5. I have refused to go out with friends or attend certain social functions to have the opportunity to view pornography.
6. I have put off important priorities to view pornography.

7. I feel ashamed after viewing pornography online.
8. I feel depressed after viewing pornography online.
9. I feel sick after viewing pornography online.

Note that decades of established addiction assessment tests for both chemical and behavioral addictions rely on similar questions to assess actual, not merely perceived, addiction. Let's compare the CPUI to a commonly used addiction assessment tool known as the "4 Cs." The CPUI questions that correlate with the four Cs are noted in parentheses.

1- Compulsion to use (2, 3)
2 - Inability to Control use (2, 3, maybe 4-6)
3 - Cravings to use (3 especially, but 1-6 could be interpreted as cravings)
4 - Continued use despite negative consequences (4-6, perhaps 7-9)

I challenge Dr. Ley to explain how each of the 9 CPUI questions assesses ONLY "perceived" porn addiction while simultaneously ignoring the signs and symptoms of actual porn addiction. Your house of cards depends upon this.

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