We have restrictions for films, pubs, and various other things. A similar system for videogames would be welcome. Yet, for some reason, it seems to be a lot more complicated.
I also see some of you people talking about how a nipple or a naked body is considered bad, yet a disembodied brain or an exploding body is perfectly ok, and wondering why this is the case. Well, sex and violence are two entirely different things. It's not the "maturity" level. It's the "content" area. You start seeing a lot of pornography and, no matter how much self-control you think you have, it will affect you in a very negative form. Yet, seeing tons and tons of violence will do nothing to you, unless you already have some sort of disorder, in which case it might do something.
I've killed so much in games like Half-Life: Source, [Prototype], Grand Theft Auto III, Shadow the Hedgehog, Halo: Combat Evolved, Doom, 007: NightFire, and so many other games, and it doesn't affect me one bit. Yet, if I were playing something like, say... a Duke Nukem game completely uncensored, I know the games' obvious sexual themes would affect me on a mental level. I wouldn't be able to get the images out of my mind, simply because I am human, just like the rest of you. Humans feel a much greater urge to sex than they do to violence. They are completely different things.
Whatever content games have, there really do need to start being more child blocks and greater awareness of the rating system for videogames, just like any other medium. A fine just might be the way to go. After all, anyone can be fined $1,000 for giving alcohol to minors for the first offense and $2,500 for each following offense. At least where I'm from, that's the case. Videogames could benefit from a similar system. Though, if it's a fine, it really shouldn't be as high as that of underaged drinking.