It's pretty common on old pulp sci-fi, like Edgar Rice Burroughs. (The Skylark books have a surprisingly large amount of nudity, as well.) The characters in P

It's pretty common on old pulp sci-fi, like Edgar Rice Burroughs. (The Skylark books have a surprisingly large amount of nudity, as well.) The characters in Princess of Mars are basically naked, except for leather harnesses to carry weapons. It's plausible that ERB was drawing on pre-existing notions about Native Americans, though the commercial appeal of sexy nude aliens is perhaps clear.