There are, and always have been games aimmed at the females, but most choose not to buy them. OK most of these games are on the DS, and a bit cheap. "lets make it pink" springs to mind. So you can see why developers arent making a special effort, unless there is a hairdressing game coming out on the Wii
Games shouldnt be gender specific anyway, its up to them to find what they like, and play it!