I'm waiting on a demo but going by the reviews that are starting to come in, if no demo is released Ill probably buy it anyway. Looks a good solid game and the first one was good once it got going. It won't be for a while though as I will finish other games first.
As for the sex, well there
are people who will buy it just for a look at some pixellated jugs...
Look at DA2 - it's selling point "whoa it's got sex in it!! must buy now!!!"
Then, after several hours "oh dear the jugs are too small and you can't see anything! This sucks!"

Witcher 2 will probably be the same. More mature people however will buy it for the rest of the game content.