I did not say "sex in video games" I said sex in media, and Rome was full of sexual promiscuity, violence and loose morals on every front. Why was Rome the way it was? Because they didn't care about the morals of one another. And that's exactly where the "civilized" world as a whole is going. People don't care that certain things cause others to have issues. They've adopted the attitude of "Ah just grow up," and "that's not my problem, it's yours" not realizing that maturity and age have nothing to do with people struggling to control themselves. You can be 80 years old and still struggling with the same things you struggled with at 15.
I know you "feel" that this is true because you watched Gladiator and are now an internet expert, but its really not. Sexuality in Rome was subject to certain complex moral and ethical standards. I am not going to get into it because it would be a dissertation and you wouldn't understand it or read it anyway. If you decide to educate yourself, start with Gibbon and go from there.
Also, other people are not subject to your personal religious morals. If it doesn't violate the law or the social contract it's not our responsibility. You are of course welcome to not play the game, which may be the easier option here.
