Well. Have you seen a lot of Roman artwork/writing and such? It isn't that they are gratuitous about it, they just had a very different view of it. Eg it wasn't uncommon for a nobleman and his wife to keep the servants in the room during sex in case they needed something.
Check out some of the mosaics and artwork from Pompeii for instance, there's some remarkably preserved "pornographic" pieces which are displayed quite openly eg in receiving rooms or on the side of buildings.
Also they were obsessed with dong-bells [technically "tintinnabulae"]. Not because they indicated brothels or anything we'd expect-- they just liked having a bunch of dongs hanging around their homes and cities.
As to violence, well, yes they did pander that. The Flavian Amphitheater was a very calculated move to sublimate the violent urges of a massive city from possible thoughts of revolt from the working class into entertainment. Check out the article for more, but for example: "Suetonius writes that 5000 animals were killed there in a single day" during the inaugural opening.
http://en.wikipedia.org/wiki/Inaugural_games_of_the_Flavian_Amphitheatre
The section on executions is especially significant:
http://en.wikipedia.org/wiki/Inaugural_games_of_the_Flavian_Amphitheatre#Executions
In short they'd often use executions by animal as a sort of dumb show to mime mythological events [eg Prometheus having his liver pecked out] for the crowd's entertainment.
So, yes the show does pander sex and violence, but so did the Roman Empire.
Tell me about it. I'm quite gay, but some of those men are actually strangely attractive. [Mostly the Germanic ones..]
Also, I can kill you with my brain.