Not for Kids

I admit, I play online games. Miniclip, Addicting Games, Nitrome, heck, I'm even kind of addicted to Mindjolt games on facebook. A lot of people play on these sites, but of the people I know, the biggest audience is kids.
The games themselves are G rated, mostly, but I'm not writing this to talk about the game. I'm talking about the advertising on the game site, or before the game even starts. How many of you have seen these advertisements:

What gamers wil be unhappy to discover is that there aren't girls like this in the game. In fact, the game is about building a medival empire and waging war on other little empires. It's actually really boring.

But the point here is, little kids can see these ads. They appear on the side of the page, and stay there the whole game sometimes. These images are a few inches short of porn, and anyone can see them.

Who is responsible for these ads being on websites? Many would say that Evony is responsible for the explicitness of the ads, and the game sites are responsible for showing the ads. But what about the internet space that is bought en masse? Adversising space that isn't actually owned by the site.

But can we stop our children from seeing this? Is there a way to keep this off sites that can be seen by children?