Two words: Earl Thompson. The man wrote novels with some really hot sex. For the faint of heart, beware that some of his novels delved into incest.
Caldo Largo is a great one without the really kinky stuff. Unfortunately, I don't think any of his works are in the ebook world.
By the way, there is another author by the name Earl Thompson. The one I like is discussed here:
http://en.wikipedia.org/wiki/Earl_Thompson