Yeah, if you want creepy sex stuff, check out Heinlein's later works. Not creepy in the sense that it's explicit....just generally creepy in a "free love carried a bit too far" kind of way. Herbert was decidedly mild by comparison.
Or then there's 'Brave New World' which very early on features a scene I won't even describe for fear of the internet police turning up. Suffice to say, if they ever try adapting that one to film again, you can file that scene under "unfilmable."