Just to add that the only source revealing that Roman 'toilet paper' was the sponge on stick is L. Annaeus Senca's (Seneca the Younger's) Letter 8, Book 70, in which he writes on suicide:
"Nay, men of the meanest lot in life have by a mighty impulse escaped to safety, and when they were not allowed to die at their own convenience, or to suit themselves in their choice of the instruments of death, they have snatched up whatever was lying ready to hand, and by sheer strength have turned objects which were by nature harmless into weapons of their own. For example, there was lately in a training-school for the wild-beast gladiators a German, who was making ready for the morning exhibition; he withdrew in order to relieve himself,-the only thing which he was allowed to do in secret and without the presence of a guard. While so engaged, he seized the stick of wood, tipped with a sponge, which was devoted to the vilest uses, and stuffed it, just as it was, down his throat; thus he blocked up his windpipe, and choked the breath from his body. That was truly to insult death! Yes, indeed; it was not a very elegant or becoming way to die; but was it more foolish than to be over-nice about dying? What a brave fellow! He surely deserved to be allowed to choose his fate! How bravely he would have wielded a sword! With what courage he would have hurled himself into the depths of the sea, or down a precipice! Cut off from resources on every hand, he yet found a way to furnish himself with death, and with a weapon for death. Hence you can understand that nothing but the will need postpone death. Let each man judge the deed of this most zealous fellow as he likes, provided we agree on this point,-that the foulest death is preferable to the fairest slavery."
(
http://www.molloy.edu/sophia/seneca/epistles/ep70.htm )
"...vilissimae sortis homines ingenti impetu in tutum evaserunt, cumque e commodo mori non licuisset nec ad arbitrium suum instrumenta mortis eligere, obvia quaeque rapuerunt et quae natura non erant noxia vi sua tela fecerunt. [20] Nuper in ludo bestiariorum unus e Germanis, cum ad matutina spectacula pararetur, secessit ad exonerandum corpus - nullum aliud illi dabatur sine custode secretum; ibi lignum id quod ad emundanda obscena adhaerente spongia positum est totum in gulam farsit et interclusis faucibus spiritum elisit. Hoc fuit morti contumeliam facere. Ita prorsus, parum munde et parum decenter: quid est stultius quam fastidiose mori? [21] O virum fortem, o dignum cui fati daretur electio! Quam fortiter ille gladio usus esset, quam animose in profundam se altitudinem maris aut abscisae rupis immisisset! Undique destitutus invenit quemadmodum et mortem sibi deberet et telum, ut scias ad moriendum nihil aliud in mora esse quam velle. Existimetur de facto hominis acerrimi ut cuique visum erit, dum hoc constet, praeferendam esse spurcissimam mortem servituti mundissimae."
(
http://www.thelatinlibrary.com/sen/seneca.ep8.shtml )
Quite a story!
