Interestingly, they note SWTOR as an exception on its genre: it does not have (proportionally) as many female players as fantasy MMO's, but it has a lot more females than other Sci-FI MMO's.
Quotes from the article:
5) High Fantasy MMO > Sci-Fi MMO
As we assembled the original MMO genre, we noticed a difference between High Fantasy and Sci-Fi MMOs, and decided to split the genre. This highlights the gender disparity in appeal based purely on thematic elements. High Fantasy MMOs have more than twice the percentage of female gamers compared with Sci-Fi gamers (36% vs. 16%).
This highlights the gender disparity in appeal based purely on thematic elements.
6) Star Wars: The Old Republic is Skewing the Genre High.
SWTOR has almost double the genre average of female gamers (29% vs. 16%). Without SWTOR, the genre average would be 11.3%, at which point the group average for High Fantasy MMOs would be more than 3 times higher than Sci-Fi MMOs.