Secessu vero Caprensi etiam sellaria excogitavit, sedem arcanarum libidinum, in quam undique conquisiti puellarum et exoletorum greges monstrosique concubitus repertores, quos spintrias appellabat, triplici serie conexi, in vicem incestarent coram ipso, ut aspectu deficientis libidines excitaret. cubicula plurifariam disposita tabellis ac sigillis lascivissimarum picturarum et figurarum adornavit librisque Elephantidis instruxit, ne cui in opera edenda exemplar imperatae schemae deesset.
(Suetonius, Tib. 43)
Then, on retiring to Capri, he* even established a suite which was to be the location for his secret pleasures. Here groups of girls and adult pathics selected from all over and the most inventive of sexual deviants whom he used to call ‘tight-bums’, would take it in turns to engage in filthy threesomes in his presence, so that the sight would arouse his flagging libido. The bedrooms were variously decked out with paintings and sculptures showing the most provocative images and figures, while the library was equipped with the works of Elephantis,** so that an illustration of the required position would always be available if anyone needed guidance in completing their performance.
** a Greek author notorious for her lewd writings.
(tr. Catharine Edwards, with her note on Elephantis)