I think "Stranger in a Strange Land" was a really silly book. I'd always liked Heinlein a lot till I read that one. As I recall I had recently read "Time Enough for Love" and that made me decide to re-read a bunch of his books. Then shortly afterward "Stranger In a Strange Land" was published and I read it and I was done with Heinlein for a few years.
I re-read it a few years ago as part of a discussion group, something I rarely do, and on second reading it was even worse. Of course most Heinlein fans think it's his best and that discussion got a bit heated, but I survived to lick my wounds.
I don't think that was really science fiction. In a lot of ways it was since it included some SF elements, but I think he was just putting his sexual fantasies on paper and I think that was the focus of that book. By the time he wrote "Friday" there wasn't much else but sexual fantasy.
This isn't all bad, I guess. The guy probably enjoyed himself.
Barry