See Superman 2: The Richard Donner cut. This is the only time a physical relationship between the two characters is explicitly implied other than golden age comics in which they have a super child, and also excluding The New Adventures of Lois and Clark, whilst Superman still has his powers. It's not that their physical bodies are too different to be compatible, btw, they can't have babies for the same reasons human can't have babies with an ape, it's the compatibility of chromosomes that determines whether two species can interbreed, like a horse and a donkey, for example, compatible enough to mate, but the offspring, a mule, is often sterile. Apparently in this story humans and kryptonians aren't compatible enough to mate at all, but that doesn't rule out a physical relationship.
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