addiction, internet gaming disorder, appears in the conditions proposed for further study in DSM-5. Psychiatrists cited a lack of research support for refusing to include other behavioral disorders at this time, a decision that has been criticized by some as being “inconsistent”. Porn addiction is not a diagnosis in DSM-5 (or any previous version). "Viewing pornography online" is mentioned verbatim in the DSM-5, but it is not considered a mental disorder either. A number of studies have found neurological markers of addiction in internet porn users, which is consistent with a large body of research finding similar markers in other kinds of problematic internet users. Yet other studies found that critical biomarkers of addiction were missing, and most addiction biomarkers have never been demonstrated for pornography. The International Classification of Disorders 11 (ICD-11) rejected "pornography addiction". Specifically, the World Health Organization (WHO) wrote: "Based on the limited current data, it would therefore seem premature to include [Internet use] in ICD-11." However, ICD-11 does include the "Compulsive sexual behaviour disorder" (CSBD) in the "impulse control disorders" section. It is defined as "a persistent pattern of failure to control intense, repetitive sexual impulses or urges resulting in repetitive sexual behaviour." David J. Ley argued that that is not an endorsement of the concept of pornography addiction. Introductory psychology textbook authors Coon, Mitterer and Martini, passingly mentioning NoFap, speak of pornography as a "supernormal stimulus" but use the model of compulsion rather than addiction. Addiction and compulsion are models of mental disorders which cancel each other out, the term "addiction" being deprecated, anyway ICD-11 does not support the existence of "porn addiction"/"sex addiction". While it has not been proven that either porn or masturbation addiction exist, porn or masturbation compulsion probably exist. The role pornography plays in the neuropsychological development of adolescents is not well understood, due to a lack of empirical research. While experimental research in the area presents considerable ethical challenges, a review which compiled evidence from other empirical sources such as surveys found that representations of women in pornography may lead adolescent boys to view women mainly as sexual objects, with probable repercussions for gender equality. The review, however, nowhere claims that it has shown a causal relationship from mainstream pornography viewing to perspectives furthering gender inequality. Besides, it nowhere states if the correlation found is large or small, numbers for it are not given either. DSM-5-TR, published in March