I'm just gonna guess and say DA's number of female fans probably outnumber those for Witcher...even if you were to take the female protagonist out of the DA games, that would probably still be the case. This is based on the fact that they are jam-packed with dynamic and interesting female NPCs that can further engage female players in a respectable way, since they are all diverse in appearances, backgrounds, and personalities, with some even having their chests covered because it's practical! From what I've read and seen, that doesn't like as much as the case for Witcher lol. (this is of course, in addition to the fact that DA has hotter dudes. Yay)
The Witcher is full of interesting female characters, too, but the game got tarred as sexist and now in some quarters- BSN being no surprise here- it's considered such no matter what they do, simply because they represent a straight male perspective without apology.
And I'm not sure how one gets away from playing that game without finding Geralt a sexy beast.
BTW Mass Effect had the ass shot from game one. Everyone mentions Miranda, but the escort in ME1 gets up in your face and then the camera cuts immediately to a shot of her jiggling ass as she walks up some stairs. Then there's the lapdance minigame across the way. But I just shake my head and enjoy a good game anyway.