Edgar Rice Burroughs
24 Tarzan books
11 Mars Tales
6 Venusian Tales
3 Moon Tales
Various othersHoratio Hornblower
11 books of Napoleonic naval warfare (and an excellent treatment on leadership and management) There is some
sexual content, but it was so vague that I had to reread the section a couple times to be sure that's what it was.
I've heard that the O'brian books (basis for Master and Commander
and written by a man who was disappointed that there were only 11 Horatio Hornblower books) are also quite good, but I haven't read them yet.Bazil Broketail
There is some sex in these books, though it's not blatant
. There is a "one night stand" in the first book within the first chapter, no details, just that it happened and the sadness it created. Later, there are some additional trysts, but it's never detailed like in a romance novel, it's mostly that it happened, not what happened.Dune
My daughter read the Dune
series of books at 9/10 and missed most of the overtones. It's a great and imaginative series, but keep them away from the last two books until you've had a chance to instill your family's particular mores into them.Star Wars
Just about any of the Star Wars
books are quite fun, action packed and enjoyable. I've met the author who wrote most of the X-wing series. Excellent books. Great guy. Well worth looking into. (Michael Stackpole, by the way.)
As a young man, I was much more interested in sci-fi than fantasy, so while the previous recommendations above that are heavily into fantasy are good, they would have left me cold and disinterested as a youth.
Larry Niven, Jerry Pournelle, Piers Anthony, Arther C. Clarke, Isaac Asimov, Andre Norton, Robert Heinlein (be careful of his later works, they can get to be a bit "dirty old man telling tales"). Gary Gygax, one of the three men who created Dungeons and Dragons
is actually quite an engaging writer.
Hope this helps.