position. A wall painting from Pompeii, however, represents a virtually unique role reversal in the giving of oral sex. The woman who receives cunnilingus is tall and shapely, well-groomed, and brazenly nude except for jewelry. The male figure is relatively small, crouching subserviently, and fully clothed; he has an anxious or furtive look. The situation is so extreme that it was probably meant to be humorous as well as titillating; other paintings in this group show a series of sex acts, at least some of which could be seen as transgressive or parodic. There is some evidence that women could hire male prostitutes to provide cunnilingus. Graffiti at Pompeii advertise the prices male prostitutes charged for cunnilingus, in the same price range as females performing fellatio; however, the graffiti could be intended as insults to the men named, and not as actual advertisements. One graffito is perhaps intended as political invective: "Vote Isidore for aedile; he's the best at licking cunt!" The Latin verb fellare is usually used for a woman performing oral sex on a man. Accusing a man of fellating another man was possibly the worst insult in all Roman invective. It was an act that might be requested from women who were infames, and not something a husband in a respectable household would have expected from his wife. Fellatio was seen as a "somewhat laughable" preference for older men who have trouble maintaining an erection, but graffiti show that the skills of a good fellatrix were enthusiastically utilized. Fellatio was a fairly uncommon subject in Roman art. Irrumatio Irrumatio is a forced form of fellatio, almost always against another man. Forcing someone to be a receptacle for oral sex was proof of virility, something to boast about, as indicated by the Priapeia and the poems of Catullus and Martial. It was also threatened as a punishment, particularly for adulterers. Martial urges a wronged husband who has already cut off the adulterous man's ears and nose to complete the humiliation by befouling his mouth with oral rape. Group sex Group sex appears in literary sources, graffiti, and art. Suetonius says that the emperor Tiberius enjoyed watching group sex, and described "chains" arranged of girls and boys: In his retreat at Capri, he put together a bedroom that was the theater of his secret debauches. There he assembled from all over companies of male and female prostitutes, and inventors