I have read all of the Dune books 1-3 are pretty clean 4-6 are a little more sex filled especially number 5 Heritics Of Dune has a major sex scene in it.
My favorite is Kaladin. The reason I like him is because he was a lowly slave brought up to someone great. My favorite battle is when Adolin has to fight multiple shardbears at ounce and Kaladin comes to help him