Anita Sarkeesian is the is the talented feminist behind the Tropes vs Women video series covering the stereotypes female video game characters, and by extension women who play those games, face. Anita Sarkeesian's Wikipedia page has a pretty good rundown of her if you are interested in some background information.
Anita was the target of some pretty vicious attacks on her character for even bringing up the problem of sexism in video games. There are plenty of people that can cover the story about what she went through better than I can, including (trigger warnings in case you are interested in clicking through) Anita on her own website.
The good news is that she has released her first installment in the series 'Tropes vs Women' on her website. There is a video and complete transcript if you prefer to read instead of watch.
Regardless of how you prefer to digest this information, if you like video games at all, or know anyone that does, it will be well worth your time to familiarize yourself with what she has to say.