The above domain is the location for the Los Alamos National Laboratory repository of e-Prints for technical papers. It is run by the United States Department of Energy. It is an entirely professional site, and the domain has existed since at least 1991 (The domain predates around 100% of the web!). It houses top notch physics and mathematics research. For the record, the web page has nothing whatsover to do with pornography.

However ... the triple-x in the URL causes it to be routinely filtered out by aggressive censorware products. When this occurs, the domain can also be accessed by the mirror URL at arXiv.org

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