Most threesomes depict two men penetrating a woman. A medallion from Roman Gaul shows two men reclining on a bed, one on the right and one on the left, with their legs extended under a woman between them. Another shows a woman "riding" a man who reclines, while a man standing behind her parts her legs to enter. A far less common variation has one man entering a woman from the rear while he in turn receives anal sex from a man standing behind him, a scenario found in Catullus, "Carmen" 56 as well as art. Catullus makes it clear that this concatenation was considered humorous, possibly because the man in the center could be a "cinaedus", a male who liked to receive anal sex but who was also considered seductive to women.