"His Cento Nuptialis is a patchwork of fragments taken from Vergil cleverly reconstructed into a hexameter poem that gives a blow-by-blow account of a defloration. In the preface, he claims he was put up to it by a challenge from the emperor Valentinian himself." (Nicholas Ostler, Ad Infinitum)
http://www.forumromanum.org/literature/ausonius_cento.html
http://www.forumromanum.org/literature/ausonius_cento.html