It's an interesting thing, that every Heinline novel from about 1960 on, except I think for his last one, makes some passing reference to sex-changes. I've never quite known what to make of that.
Much as I enjoyed (and still enjoy) his juvies, just about everything he wrote in his last thirty or so years boils down to people flying around the universe arguing endlessly about sex and who's in charge.
>>Much as I enjoyed (and still enjoy) his juvies, just about everything he wrote in his last thirty or so years boils down to people flying around the universe arguing endlessly about sex and who's in charge.<<
That kind of mentality domenate science fiction like cancer dominates the lungs of a 30 year long chain smoker !
That is all we get from faggoty Canada; War of the Sexes !
(PS, Heinlein reportedly invented the Water Bed)