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Wikipedia depends on WP:V. If a reliable source mention there is a NMD in Japan, we have to add it. The quote from the book is ""In Japan, there is a national masturbation day. Many websites boast about May being International Masturbation Month in which, among other activities, people are encouraged to get involved in masturbate-a-thons, various forms of self-loving, and mutual sexual play."" This reference is checked by   Talk "