"Riding" is a common metaphor for the sex act, particularly used of the woman-on-top position. The "mulier equitans" ("woman riding") does not appear in Greek vase painting but is popular in Roman art. Ovid recommends it for the petite woman, as a tall woman may not wish to seem too towering in relation to the man. Supposedly favored by the mythological couple Hector and Andromache, even though she was of legendary height, it was jokingly called "the Hector horse". One relief from Roman Gaul showing the "mulier equitans" plays on the metaphor by picturing a galloping horse within a frame in the background (see first image in gallery below).