Groups like the IGDA (International Game Developer Association) do breakdowns of what types of games each gender play. It also does breakdowns of how many of each age/gender play. They then play around with those stats to try to make it seem more equal (woman in this group are equal in size to these 2 male groups, see they're even).

The actual audience ratio goes (largest to smallest): Casual & Mobile > Farming > MMORPG > JRPG (27%) > WRPG (25%) ... Sports & Racing > FPS (1%)

Groups like the IGDA (International Game Developer Association) do breakdowns of what types of games each gender play. It also does breakdowns of how many of each age/gender play. They then play around with those stats to try to make it seem more equal (woman in this group are equal in size to these 2 male groups, see they're even).

The actual breakdown of game types has woman being primarily casual gamers (there's even genres like hidden object that most people don't know of aimed at this group). Following that it's RPGs (MMO > JRPG > WRPG) at about 25% of the audence. Sports, Racing, and FPS have the least amount, with woman being 1% of the FPS audience.