I'm convinced that our focus needs to be on adding more cool players to the hobby, than on any particular gender. D&D, like any hobby, needs new blood on a constant basis. Women are great, but quite honestly D&D does not require a certain male/female ratio to keep on trucking. It just needs people, preferably people who enjoy the game and make it fun for others to enjoy. I can't wait for the day when threads like this - the sort that tries to develop a strategy for recruiting a certain gender - no longer need to exist. When I'm at the game table, I'm less concerned about how many male players I have versus how many female players I have. What I'm really concerned about is how many good players I have.
Nedjer - for some reason your post seems to be un-quotable. Anyway...
You cite a whole bunch of studies there, but so far as I can tell, none of them has anything to do with tabletop RPGs except in an extremely tangential way. Your points in the essay go light-years beyond what your cited evidence supports.
If you want to talk about where all the female gamers went (or didn't go), how about some studies on, y'know, female gamers? Or on women in society at large and their attitudes toward and knowledge of RPGs, compared with those of men?
It's the opposite of tangential. It's systemic. You take all the data sets at different levels of observation and merge the data. If, for example, several valid, reliable studies of conflict amongst children show, as they do, that girls' childhood roleplaying consistently demonstrates less direct conflict than boys' roleplaying, it is possible to propose that this will apply in other similar contexts.
The videogame industry does stacks of research on games. Can all of that shed no light at all on roleplaying games? Academics do loads of research on teaching through roleplaying - what could be more relevant to parents interested in shared roleplaying in the home? Psychologists identify patterns in human behaviours which operate across all of our social activities . . .
The first time you see an RPG that actually appeals to women is Vampire - and it was riding the Anne Rice wave of horror readers. Vampires have HUGE appeal to women readers.
Girls generally have more social skills at a younger age than boys.
They also tend to be involved in more elaborate pre-school roleplaying than most boys.
As girls get older many enjoy videogame RPGs, puzzle games and ARGs. They also take part in fantasy gaming ’spin-offs’, such as writing fan fiction, visiting videogame forums and drawing fantasy art. However, very few female gamers seem to become involved in tabletop RPGs and even fewer go on to run games.
Many, predominantly male, tabletop RPG players express surprise at the low number of teenage and adult female players.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.