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Not having any luck googling, but I have one idea. The Pompeii graffiti unless we got something earlier? I don't know it by heart anything but I can look that up.
I.2.20 (Bar/Brothel of Innulus and Papilio); 3932: Weep, you girls. My penis has given you up. Now it penetrates men’s behinds. Goodbye, wondrous femininity!
I.2.23 (peristyle of the Tavern of Verecundus); 3951: Restitutus says: “Restituta, take off your tunic, please, and show us your hairy privates”.