Topics: Sexuality in ancient Rome - Wikipedia
A late 20th-century paradigm analyzed Roman sexuality in terms of a "penetrator–penetrated" binary model , a misleadingly rigid analysis that may obscure expressions of sexuality among individual Romans.  Even the relevance of the word " sexuality " to ancient Roman culture has been disputed,    but in the absence of any other label for "the cultural interpretation of erotic experience", the term continues to be used. 
Erotic art, especially as preserved in Pompeii and Herculaneum , is a rich if not unambiguous source; some images contradict sexual preferences stressed in literary sources and may be intended to provoke laughter or challenge conventional attitudes.  Everyday objects such as mirrors and serving vessels might be decorated with erotic scenes; on Arretine ware , these range from "elegant amorous dalliance" to explicit views of the penis entering the vagina.  Erotic paintings were found in the most respectable houses of the Roman nobility , as Ovid notes:
Just as venerable figures of men, painted by the hand of an artist, are resplendent in our houses, so too there is a small painting (tabella)  in some spot which depicts various couplings and sexual positions : just as Telamonian Ajax sits with an expression that declares his anger, and the barbarian mother ( Medea ) has crime in her eyes, so too a wet Venus dries her dripping hair with her fingers and is viewed barely covered by the maternal waters.