They are unlocked by plot events, so it's hard to be specific. Denerim's Alienage only opens after you finish all four recruitment quests, for example.
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Dragon Age Origins is for PS3, Xbox-360, And PC.
The answer is yes. Dragon Age Origins is downloadable to PC through this site: http://www.ea.com/games/dragon-age-origins As well as a few others most likely : )
A little. In Dragon Age: Origins, one female demon briefly shows her breasts. There is no nudity after that, though.Source: http://www.commonsensemedia.org/game-reviews/dragon-age-origins
no
Yes, you can.