"The most explicit recorded incidents of public sex involving humans and animals activity are associated with the murderous sadism, torture and rape of the Roman games and circus, in which it is estimated that several hundreds of thousands died. Masters reports: 'Beasts were specially trained to copulate with women: if the girls or women were unwilling then the animal would attempt rape. A surprising range of creatures was used for such purposes - bulls, giraffes, leopards, cheetahs, wild boar, zebras, stallions, jackasses, huge dogs, apes, etc. The beasts were taught how to copulate with a human being [whether male or female] either via the vagina or via the anus.' Representations of scenes from the sexual lives of the gods, such as Pasiphaë and the Bull, were highly popular, often causing extreme suffering, injury or death. On occasion, the more ferocious beasts were permitted to kill and (if desired) devour their victims afterwards. Chimpanzees and mandrills, both in fact ferocious and very powerful species of primate: 'made drunk by wine and inflamed by the odor of females of their kind, were loosed upon girls whose genitals had been drenched with the urine of female chimps and mandrills.' The victims were often virgins and not infrequently young children. One spectacle is said to have included 'a hundred tiny blonde girls being raped simultaneously by a horde of baboons.'"

this used to be in this article but got deleted, special mention:

One spectacle is said to have included 'a hundred tiny blonde girls being raped simultaneously by a horde of baboons.