Its no secret Nintendo has figured out the female market. They show graphs to this effect every chance they get. They own the female market, and soon will move to take control of every female in the world. Nintendo has a master plan.
All jokes aside, my girlfriend pretty much loves all Nintendo games and has ever since the GameCube days. So its not a hard sell to get women to like Nintendo. From Zelda to Pikmin, Mario to Animal Crossing, they know what they're doing. And they're doing it better than anyone else.