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Some examples of the latter are games where you play as a robot (Armored Core), games where the main character is not shown (Bejeweled 2), or games where you play as an asexual character and the sex is not clearly determined (de Blob).
Here's the graph that we came up with (click on it to enlarge):
With the exception of Social & Economic Sim and Music & Rhythm games, most genres are decidedly dominated by games that only provide playable male characters. Social & Economic Sim titles, which tend to fall under the Casual banner, is the only genre to offer more titles with playable females than males.
Interestingly, the Role Playing Games we analyzed -- which have an extremely high percentage (79 percent) of games with both playable male and female characters due to their tendency to offer character customization options and a wealth of premade archetypes -- did not provide any titles at all with only playable female characters. However, 18% of RPGs limit players to only playable male characters.
While the "Both" category (not shown) tends to be the largest for the majority of the genres, there are a few, such as Shooter and Sports, where the overwhelming majority only offer playable male characters.
For those wondering about the 1 percent that offered only playable females in Shooters and Sports games, those few titles included Alien Syndrome, Bullet Witch, and Dead or Alive: Xtreme 2.
[Jesse Divnich currently serves as the Director of Analyst Services at Electronic Entertainment Design and Research (EEDAR). The preceding is the views and opinions of one person and not of EEDAR, The GamerMetrics, or Gametrailers.]