Yes, these are real.
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”.
I.4.5 (House of the Citharist; below a drawing of a man with a large nose); 2375:
Amplicatus, I know that Icarus is buggering you. Salvius wrote this.
I.10.4 (exterior of the House of Menander); 8304:
Satura was here on September 3rd
II.7 (gladiator barracks); 8767:
Floronius, privileged soldier of the 7th legion, was here. The women did not know of his presence. Only six women came to know, too few for such a stallion.
V.5.3 (barracks of the Julian-Claudian gladiators; column in the peristyle); 4289:
Celadus the Thracian gladiator is the delight of all the girls
VII.2.18 (vicolo del Panattiere, House of the Vibii, Merchants); 3117:
Atimetus got me pregnant
VIII.2 (in the basilica); 1826:
Phileros is a eunuch!
Herculaneum (on the exterior wall of a house); 10619:
Apollinaris, the doctor of the emperor Titus, defecated well here
Graffiti from Pompei