
Caligula is one hell of a porn film, above any other label. Of course orgies were a common thing in ancient Rome, and in a lot more civilizations by then, and so there's absolutely no reason to produce any other, far from the truth, prudish depiction of the Roman living like Hollywood got people used to. And yes, the added sex scenes are a bit too excessive, too extravagant and too perverse, and there's controversy on that, but then wouldn't be a real portrayal of the history, specially on Caligula's reign.