Personally, I'm hoping that Stranger in a Strange Land was up for being banned because of the appalling sexism, but I suspect that isn't the case! It probably is the polyamory and cannibalism - it would be jsut typical for the cause to be the interesting bits thematically and not the skeevy underlying assumptions about women that still make me want to bite something. Gah, Heinlein. All that imagination and he couldn't imagine himself out of his own mindset.