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We examined whether online warning messages would dissuade individuals from visiting a honeypot website purporting to contain barely legal pornography. Participants ( n = 419) seeking the site were randomly assigned to one of five conditions; they went straight to the landing page (control; n = 100) or encountered a warning message advising of the potential harm to viewers ( n = 74), potential harm to victims ( n = 65), ability of police to track IP addresses ( n = 81), or possible illegality of such pornography ( n = 99). We measured the attempted click-through to the site. Attrition rates for the warning message conditions were 38% to 52%, compared with 27% for the control group. The most effective messages were those that warned that IP addresses can be traced (odds ratio [OR] = 2.64) and that the pornography may be illegal (OR = 2.99). We argue that warning messages offer a valuable and cost-effective strategy that can be scaled up to help reduce the accessing of CSEM online.<\/jats:p>","DOI":"10.1177\/10790632211013809","type":"journal-article","created":{"date-parts":[[2021,5,15]],"date-time":"2021-05-15T04:18:27Z","timestamp":1621052307000},"page":"106-124","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":33,"title":["Effects of Automated Messages on Internet Users Attempting to Access \u201cBarely Legal\u201d Pornography"],"prefix":"10.1177","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8481-7100","authenticated-orcid":false,"given":"Jeremy","family":"Prichard","sequence":"first","affiliation":[{"name":"University of Tasmania, Hobart, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard","family":"Wortley","sequence":"additional","affiliation":[{"name":"University College London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul A.","family":"Watters","sequence":"additional","affiliation":[{"name":"Cyberstonomy Pty Ltd"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caroline","family":"Spiranovic","sequence":"additional","affiliation":[{"name":"University of Tasmania, Hobart, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Charlotte","family":"Hunn","sequence":"additional","affiliation":[{"name":"University of Tasmania, Hobart, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tony","family":"Krone","sequence":"additional","affiliation":[{"name":"University of Canberra, Australian Capital Territory, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2021,5,15]]},"reference":[{"key":"bibr1-10790632211013809","unstructured":"Akhawe D., Felt A. 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