That all changed in December 1978.
Director Richard Donner was careful to include every familiar aspect of the Superman myth: the doomed planet Krypton, the elderly farm couple of Smallville, the Daily Planet, Perry White, Lois Lane, Jimmy Olsen, the Fortress of Solitude, Lex Luthor. And some from the familiar TV Superman of the 1950s, who used to change clothes in a phone booth (no old-style phone booths left in 1978).
Indeed, everyone was so busy checking off their list of Superman conventions that they forgot to pay attention to the plot: Lex Luthor plans to drop a nuclear bomb on the San Andreas Fault, thus causing California to slip into the ocean, whereup he will get rich by selling prime oceanside real estate in Nevada.
Ok, that was ridiculous even for a comic book.
He didn't disrobe during the movie, but he favored us with some beefcake shots in teen magazines and in the faux-gay After Dark.
He was interviewed in gay magazines, an almost unprecedent act of solidarity in the 1970s, and in 1982 he played a gay character, the protege of playwright Sidney Bruhl (Michael Cane) in Death Trap. I can still remember the gasps of shock when the two characters kissed on-camera.
Gay-positive Christopher Reeve and his studly physique provided the only gay interest in Superman. No buddy-bonding in high school, no boy pal, no subdued homoromantic sniping with Lex Luthor.
It was a heterosexual love story, and rather a sappy one. Audiences twittered and squirmed when Superman and Lois Lane (Margot Kidder) flew endlessly through the skies of Metropolis hand in hand, while Lois thought: "Can you feel what I feel? Do you know what you're doing to me?"
On the other hand, she wasn't a complete Girl Scout. She asked, "How big are you...um, I mean, how tall?", leading to considerable speculation about the Man of Steel's package.
Christopher Reeve was paralyzed in an equestrian accident in 1995, and died in 2004. Margot Kidder died in 2018. They're both gone, but that magical night in the midst of a cold, dark, dreary winter lives on.