As the next generation of video game systems starts with the Xbox 360, games are becoming more realistic than ever. But as technology improves, it opens the door to vulgar depictions of sex and violence.

Most parents want to steer their children clear of games that violate their values. But that can be difficult, especially for parents who aren't game players. So I've got a few tips that can help you choose games for your kids.

Check the ratings

Most video games receive ratings from the Entertainment Software Rating Board (ESRB). Ratings are prominently featured on game packaging. They include Early Childhood, Everyone, Teen, Mature and Adults Only. Most also include brief descriptions, such as "Blood and Gore," "Sexual Themes" or "Use of Drugs."

You don't have to browse stores to see these ratings. The ESRB Web site allows you to check game ratings through a title search. You can also study the rating criteria and see a list of ESRB's descriptions.

Read reviews

You can get more thorough information about particular games by reading professional reviews. A review will often include a detailed summary of a game's story and major themes. Some also include photos.