They did go down on each other regularly. Fellatio was common, not cunnilingus. There are lots of fun Latin words for face-fucking.

Roman sexuality just was very penis centric in general. They really struggled with understanding lesbians - they assumed that the more dominant woman would grow a penis or something.

The term for a man who performs oral sex on a woman is cunnilinctor, and this kind of man is highly stigmatized. In the Roman mindset, to perform oral sex on anyone is to make oneself passive, to choose to be orally fucked by that person. According to their phallocentric model, then, the Romans conceptualize the cunnilinctor as a man being orally penetrated by a woman.

Like in a way, they did think eating pussy was “gayer” then sucking off a guy who was higher in social status than you.