Oh god the baboon/chimpanzee/gorilla/macaque/whatever fucking nonsense they want to say this time claim. There's no textual attestation for this. The work usually trotted out in these sort of discussions is Mannix's Those About to Die, whose worth I have addressed before (the deleted comment referred to Mannix's description of training an animal to have intercourse with an actress--see also this chain, from the same comment). Mannix's book is more a description of his own fascinating personal involvement with carnival culture than anything Roman--he studied zoology and journalism, and I can find no confirmation that he knew either Latin or Greek. The passage in Mannix's book usually used to support this bizarre idea describes chimpanzees that Mannix claims were gotten drunk on wine and released in the arena to rape girls tied to stakes. He adds an additional note that the Romans thought chimpanzees were satyrs when they first encountered them. One questions how Mannix can know this, since there's no word in Latin for a chimpanzee (unlike, say, gorilla, or any other of the myriad, very specific, words for apes and monkeys in Latin and Greek) and there's no evidence to suggest that the Romans knew about them at all--it's been proposed that Pliny's comment about the sphinx is in fact a much-distorted reference to chimpanzees, but he places it alongside reports of winged horses and manticores. Certainly nothing like Mannix's comment exists in the texts. Mannix's book is full of bizarre, totally unsourced assertions like this--he doesn't even bother quoting the texts in English, much less their original languages. His comment referred to in the thread to which I linked seems to be some bizarre misunderstanding of the Golden Ass as a historical text (nevermind that the narrator is a fucking donkey), and he combines a particularly satirical passage of Apuleius (who delights in describing bizarrely amusing sexual deviancy, some of which are probably interpolations into the text) with a little dash of Martial and a much larger dash of his own fancy.