I also failed to complete reading Time Enough for Love by Heinlein. Heinlein was a pretty good writer, but.... OI! 85% of the book was spent trying to demonstrate that we all have our perception of sex all screwed up (no pun)- and in a more enlightened age, we would all treat it very casually. Hi, I'm your neighbor, may I borrow some sugar? Drop by for some sex later! Anytime!
I gave up. He wasn't graphic, just ridiculous. So convinced that he was sane and the everyone else on the planet delusional.