caressed provides its own particular pleasure". Propertius connects breast development with girls reaching an age to "play". Tibullus observes that a woman just might wear loose clothing so that her breasts "flash" when she reclines at dinner. An astrological tradition held that mammary intercourse was enjoyed by men born under the conjunction of Venus, Mercury, and Saturn. Even in the most sexually explicit Roman paintings, however, the breasts are sometimes kept covered by the strophium (breast band). The women so depicted may be prostitutes, but it can be difficult to discern why an artist decides in a given scenario to portray the breasts covered or exposed. Female–female sex Greek words for a woman who prefers sex with another woman include hetairistria (compare hetaira, "courtesan" or "companion"), tribas (plural tribades), and Lesbia; Latin words include the loanword tribas, fricatrix ("she who rubs"), and virago. References to sex between women are infrequent in the Roman literature of the Republic and early Principate. Ovid, who advocates generally for a heterosexual lifestyle, finds it "a desire known to no one, freakish, novel ... among all animals no female is seized by desire for female". During the Roman Imperial era, which many Roman writers perceived as more decadent than the Republican period, sources for same-sex relations among women are more abundant, in the form of love spells, medical writing, texts on astrology and the interpretation of dreams, and other sources. A graffito from Pompeii expresses the desire of one woman for another: I wish I could hold to my neck and embrace the little arms, and bear kisses on the tender lips. Go on, doll, and trust your joys to the winds; believe me, light is the nature of men. An early reference to same-sex relations among women as "lesbianism" is found in Lucian (2nd century AD): "They say there are women like that in Lesbos, masculine-looking, but they don't want to give it up for men. Instead, they consort with women, just like men." Since Romans thought a sex act required an active or dominant partner who was "phallic" (see "Phallic sexuality" above), male writers imagined that in lesbian sex one of the women would use a dildo or have an exceptionally large clitoris for penetration, and that she would be the one experiencing pleasure. Martial describes lesbians as having outsized sexual appetites and performing penetrative sex on both women and boys. Imperial portrayals