Four color carnality: A Study of Superhuman Sensuality by “John Jones, Manhunter from Marathon, IL” surveys the state of romatic superhero literature throughout the ages:
To sum up the 70s, then… At DC, it was still, for the vast most part, business as usual, meaning, all their characters might as well have been genderless androids. At Marvel, on the other hand, gorgeous women were screwing waterfowl, Vietnamese boom-boom girls were joining the Avengers, female vampires were starring in their own horror series and using sex appeal to lure hapless male victims to the slaughter, and cheesy warlords from alternate futures were showing up with raging woodies for captive super-heroines. Everybody, even the morose, petulant Peter Parker, was getting laid.
Found via John Jakala’s Grotesque Anatomy.