A significant portion of the usenet is devoted to adult newsgroups. Adult newsgroups usually follow the pattern "alt.binaries.pictures.erotica ". A good example is "alt.binaries.pictures.erotica.amateur.female", which is a generic group for amateur female pictures.
Usenet Newsgroup Search results for adult newsgroup names containing alt. binaries.erotic on free and commercial Usenet servers - freenews.maxbaud.net.
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free.uk.london.young-adults, adult, < 1000. alt.test. looks.like.a.young.kevin-nash, < 1000. alt.fred-hall.likes-em-young-like-gary- does.