A visitor to this year's Electronic Entertainment Expo in Los Angeles plays a demo of "Warframe" at the Sony Playstation 4 booth.
A visitor to this year's Electronic Entertainment Expo in Los Angeles plays a demo of "Warframe" at the Sony Playstation 4 booth.

Story highlights

Report: Almost half of video game players in U.S. are female

Gamers cite a rise in strong female characters in top titles

In gaming circles, though, some say "boys' club" mentality persists

Marketing overwhelmingly still targets young males

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