In late 1965, Supergirl and Wonder Woman starred in The Brave & the Bold #63 - "The Revolt of the Super-Chicks!", a love letter to conformity and traditional gender roles. The premise: lacking romance because she's seen as too intimidating for men, Supergirl abandons her role as a superheroine so she can focus on being what men want: something feminine, i.e., weak and frail. That's not subtext in this story, it's flat out text:
It seems laughable on the face of it that men wouldn't be attracted to an adorable blonde co-ed in a skintight leotard and miniskirt, but in the world of sixties comics, apparently Supergirl can't catch a break in the dating game. So she takes drastic measures...
Superman, playing the voice of masculine authoritarianism, tries to convince his cousin that she's making a bad decision. But she's a little too clever for Supes, with hilarious results:
"Why...uh...ulp...I - I'm very FOND of girls...I...uh.." Methinks thou dost protest too much, Superman.
Supergirl figures that Paris is the home of romance and the best place to get some action, and she's right - no sooner does she set foot in the City of Lights that she becomes a "glamorpuss playgirl," at least according to Wonder Woman, dispatched by Superman to talk sense into his cousin. But Supergirl is a bad influence, and soon enough Wonder Woman finds herself a suave French playmate as well...
...a chauvinist dimwit who thinks fighting crime is unfeminine. Tell that to the world's female police officers! And yet, Wonder Woman buys into her lover's point of view without question.
Meanwhile, some boulders conveniently fall out of nowhere to reinforce the sexist point. "If I stop them with my super-powers, I'll no longer seem feminine to him!" You know, if Sylvia could throw boulders, I'd still be attracted to her. Were men really this insecure in the sixties?
The rest of the story is cheerfully mundane; Supergirl and Wonder Woman team up to fight the forgettable Multi-Face and realize that they must continue to serve as superheroines, foregoing romance. It's as if the two endeavors are completely incompatible, yet super-heroes have no trouble fighting crime and having girlfriends. No double standard there!