Trust me, Remus, Stranger In A Strange Land had nothing but a bit of free sex. Some of his later books are totally obsessed.
Time Enough For Love, I already mentioned.
I Will Fear No Evil was pretty out there, too. Iirc, it was about an old man who dies of old age but is somehow put into the body of a young attractive woman (details are a bit hazy) who then starts shagging everyone, starting with her (his?) driver and bodyguards. It has some worrying content like this man-in-a-woman's body chimera curling into various men's laps and saying she deserves a spanking before more sex, some of it with multiple partners.
Well i just have to say this is the longest thread i ever started! But it has inspired me to look again at Attwood and i'll be definately giving her another go. I'll be surprised if i can beat HMT but you never know. How i love that book!
My Heinlein period was late teens, so can't say what I would think of his books now, but I loved SIASL, Time Enough For Love, and Friday. Even then I do remember thinking that he is a bit too far gone when I read To Sail Beyond The Sunset, I Will Fear No Evil etc.
Maybe he was impotent in his later years, hence the obsession with everyone having sex with everyone. Who knows what he would have written if he could get a few little blue pills?
Remus - I liked DADOES. Philip K Dick has written many books - one of the benefits of writing under the influence of amphetamines was that he wrote fast, apparently) but I can't think of any that I didn't really like. Some I thought were brilliant, and the rest surprisingly good, considering that he has written all this sci-fi back when there was no such thing as a PC or even a mobile phone.
My favourite Philip K Dick books are: Martian Time Slip - Complete mind-bender. It gave me an exquisite headache as I tried to keep up with the story. A Scanner Darkly - Not sci-fi, really, and quite different than the rest of his work. Dark and brilliant. The film was truly awful, though.
His books of short stories are also worth reading. Films such as Minority Report, Total Recall, Impostor, and Paycheck were based on his short stories and all feature Dick's trademark "Am I really here? Is this real?" kind of scenarios.
Alias Grace and Oryx and Crake were both very good. I started After The Flood about 6 months ago then put to one side to read something else for a while but never really got back into it. I have The Blind Assassin on my shelf waiting for a suitable moment - will hopefully give it a go soon.